642556326860 has 24 divisors (see below), whose sum is σ = 1542135184800. Its totient is φ = 220305026304.

The previous prime is 642556326821. The next prime is 642556326877. The reversal of 642556326860 is 68623655246.

It is a happy number.

It is a super-3 number, since 3×642556326860³ (a number of 36 digits) contains 333 as substring.

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, 2294843885 + ... + 2294844164.

It is an arithmetic number, because the mean of its divisors is an integer number (64255632700).

Almost surely, 2^642556326860 is an apocalyptic number.

It is an amenable number.

642556326860 is an abundant number, since it is smaller than the sum of its proper divisors (899578857940).

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

642556326860 is a wasteful number, since it uses less digits than its factorization.

642556326860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4589688065 (or 4589688063 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 53.

The spelling of 642556326860 in words is "six hundred forty-two billion, five hundred fifty-six million, three hundred twenty-six thousand, eight hundred sixty".