642891630872 has 16 divisors (see below), whose sum is σ = 1217356678800. Its totient is φ = 318263183200.

The previous prime is 642891630853. The next prime is 642891630889. The reversal of 642891630872 is 278036198246.

642891630872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397828172 + ... + 397829787.

It is an arithmetic number, because the mean of its divisors is an integer number (76084792425).

Almost surely, 2^642891630872 is an apocalyptic number.

It is an amenable number.

642891630872 is a deficient number, since it is larger than the sum of its proper divisors (574465047928).

642891630872 is a wasteful number, since it uses less digits than its factorization.

642891630872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795658066 (or 795658062 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 642891630872 in words is "six hundred forty-two billion, eight hundred ninety-one million, six hundred thirty thousand, eight hundred seventy-two".