642706605252 has 72 divisors (see below), whose sum is σ = 1641486118272. Its totient is φ = 212020286400.

The previous prime is 642706605239. The next prime is 642706605269. The reversal of 642706605252 is 252506607246.

642706605252 is a `hidden beast` number, since 64 + 2 + 7 + 0 + 6 + 60 + 525 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 642706605198 and 642706605207.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1545102 + ... + 1916442.

Almost surely, 2^642706605252 is an apocalyptic number.

It is an amenable number.

642706605252 is an abundant number, since it is smaller than the sum of its proper divisors (998779513020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642706605252 is a wasteful number, since it uses less digits than its factorization.

642706605252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371849 (or 371844 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 642706605252 in words is "six hundred forty-two billion, seven hundred six million, six hundred five thousand, two hundred fifty-two".