# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/willem-klein
# Generated: 2026-08-13T18:52:37.988Z

schema: https://schema.org/Person
url: "https://fame.am/person/willem-klein"
name: "Willem Klein"
slug: "willem-klein"
description: "Willem Klein, also known as Wim Klein or under his stage names Pascal and Willy Wortel, was a Dutch mental calculator, famous for ability to perform very complicated calculations in his head very fast. On 27 August 1976, he calculated the 73rd root of a 500-digit number in 2 minutes and 43 seconds. This feat was recorded by the Guinness Book of Records."
tagline: "Dutch mental calculator (1912–1986)"
gender: "male"
category:
  name: "Academics"
  slug: "academics"
profileType:
  name: "Academic"
  slug: "academic"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1912-12-04"
deathDate: "1986-08-01"
livingStatus: "DECEASED"
scores:
  popularity:           46.23
  momentum:             9.192436040044495
  historical:           9.149749333333332
  currentAttention:     0
  sourceConfidence:     54.99999999999999
  profileCompleteness:  45
  trendDirection:       "RISING"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://ru.wikipedia.org/wiki/%D0%9A%D0%BB%D0%B5%D0%B9%D0%BD%2C_%D0%92%D0%B8%D0%BB%D0%BB%D0%B5%D0%BC"
    title: "Клейн, Виллем"
    type:  "WIKIPEDIA"
  - url: "https://ar.wikipedia.org/wiki/%D9%88%D9%8A%D9%84%D9%8A%D9%85_%D9%83%D9%84%D8%A7%D9%8A%D9%86"
    title: "ويليم كلاين"
    type:  "WIKIPEDIA"
  - url: "https://arz.wikipedia.org/wiki/%D9%81%D9%8A%D9%84%D9%8A%D9%85_%D9%83%D9%84%D8%A7%D9%8A%D9%86"
    title: "فيليم كلاين"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Willem_Klein"
    title: "Willem Klein"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Willem_Klein"
    title: "Willem Klein"
    type:  "WIKIPEDIA"
  - url: "https://es.wikipedia.org/wiki/Willem_Klein"
    title: "Willem Klein"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/Wim_Klein"
    title: "Wim Klein"
    type:  "WIKIPEDIA"
  - url: "https://he.wikipedia.org/wiki/%D7%95%D7%99%D7%9C%D7%9D_%D7%A7%D7%9C%D7%99%D7%99%D7%9F"
    title: "וילם קליין"
    type:  "WIKIPEDIA"
  - url: "https://it.wikipedia.org/wiki/Willem_Klein"
    title: "Willem Klein"
    type:  "WIKIPEDIA"
  - url: "https://nl.wikipedia.org/wiki/Willem_Klein"
    title: "Willem Klein"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q2069856"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump