642694900875 has 64 divisors (see below), whose sum is σ = 1075307425920. Its totient is φ = 340896000000.

The previous prime is 642694900829. The next prime is 642694900889. The reversal of 642694900875 is 578009496246.

It is not a de Polignac number, because 642694900875 - 2¹⁵ = 642694868107 is a prime.

It is a super-2 number, since 2×642694900875² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60620575 + ... + 60631175.

It is an arithmetic number, because the mean of its divisors is an integer number (16801678530).

Almost surely, 2^642694900875 is an apocalyptic number.

642694900875 is a deficient number, since it is larger than the sum of its proper divisors (432612525045).

642694900875 is a wasteful number, since it uses less digits than its factorization.

642694900875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11489 (or 11479 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 642694900875 in words is "six hundred forty-two billion, six hundred ninety-four million, nine hundred thousand, eight hundred seventy-five".