642607565670 has 64 divisors (see below), whose sum is σ = 1958423063040. Its totient is φ = 146881728864.

The previous prime is 642607565573. The next prime is 642607565683. The reversal of 642607565670 is 76565706246.

642607565670 is a `hidden beast` number, since 6 + 4 + 2 + 6 + 0 + 7 + 565 + 6 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170000112 + ... + 170003891.

It is an arithmetic number, because the mean of its divisors is an integer number (30600360360).

Almost surely, 2^642607565670 is an apocalyptic number.

642607565670 is an abundant number, since it is smaller than the sum of its proper divisors (1315815497370).

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

642607565670 is a wasteful number, since it uses less digits than its factorization.

642607565670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340004026 (or 340004020 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 54.

The spelling of 642607565670 in words is "six hundred forty-two billion, six hundred seven million, five hundred sixty-five thousand, six hundred seventy".