642005563211 has 4 divisors (see below), whose sum is σ = 669918848592. Its totient is φ = 614092277832.

The previous prime is 642005563127. The next prime is 642005563217. The reversal of 642005563211 is 112365500246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642005563211 - 2¹⁴ = 642005546827 is a prime.

It is a super-2 number, since 2×642005563211² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642005563217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13956642656 + ... + 13956642701.

It is an arithmetic number, because the mean of its divisors is an integer number (167479712148).

Almost surely, 2^642005563211 is an apocalyptic number.

642005563211 is a deficient number, since it is larger than the sum of its proper divisors (27913285381).

642005563211 is a wasteful number, since it uses less digits than its factorization.

642005563211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27913285380.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 642005563211 in words is "six hundred forty-two billion, five million, five hundred sixty-three thousand, two hundred eleven".