642636004044 has 24 divisors (see below), whose sum is σ = 1564678967040. Its totient is φ = 204898435984.

The previous prime is 642636004037. The next prime is 642636004091. The reversal of 642636004044 is 440400636246.

It is a junction number, because it is equal to n+sod(n) for n = 642636003993 and 642636004011.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1164195384 + ... + 1164195935.

It is an arithmetic number, because the mean of its divisors is an integer number (65194956960).

Almost surely, 2^642636004044 is an apocalyptic number.

It is an amenable number.

642636004044 is an abundant number, since it is smaller than the sum of its proper divisors (922042962996).

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

642636004044 is a wasteful number, since it uses less digits than its factorization.

642636004044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328391349 (or 2328391347 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 39.

The spelling of 642636004044 in words is "six hundred forty-two billion, six hundred thirty-six million, four thousand, forty-four".