642465558108 has 36 divisors (see below), whose sum is σ = 1771647449208. Its totient is φ = 194686532640.

The previous prime is 642465558103. The next prime is 642465558143. The reversal of 642465558108 is 801855564246.

642465558108 is a `hidden beast` number, since 6 + 4 + 2 + 4 + 6 + 55 + 581 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642465558103) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 811193491 + ... + 811194282.

Almost surely, 2^642465558108 is an apocalyptic number.

It is an amenable number.

642465558108 is an abundant number, since it is smaller than the sum of its proper divisors (1129181891100).

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

642465558108 is a wasteful number, since it uses less digits than its factorization.

642465558108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622387794 (or 1622387789 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 54.

The spelling of 642465558108 in words is "six hundred forty-two billion, four hundred sixty-five million, five hundred fifty-eight thousand, one hundred eight".