642899756364 has 24 divisors (see below), whose sum is σ = 1551826998960. Its totient is φ = 206910266304.

The previous prime is 642899756353. The next prime is 642899756407. The reversal of 642899756364 is 463657998246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 923706199 + ... + 923706894.

It is an arithmetic number, because the mean of its divisors is an integer number (64659458290).

Almost surely, 2^642899756364 is an apocalyptic number.

It is an amenable number.

642899756364 is an abundant number, since it is smaller than the sum of its proper divisors (908927242596).

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

642899756364 is a wasteful number, since it uses less digits than its factorization.

642899756364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847413129 (or 1847413127 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 69.

The spelling of 642899756364 in words is "six hundred forty-two billion, eight hundred ninety-nine million, seven hundred fifty-six thousand, three hundred sixty-four".