642187875164 has 96 divisors (see below), whose sum is σ = 1282182967296. Its totient is φ = 278834431680.

The previous prime is 642187875127. The next prime is 642187875227. The reversal of 642187875164 is 461578781246.

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, 185226959 + ... + 185230425.

It is an arithmetic number, because the mean of its divisors is an integer number (13356072576).

Almost surely, 2^642187875164 is an apocalyptic number.

It is an amenable number.

642187875164 is a deficient number, since it is larger than the sum of its proper divisors (639995092132).

642187875164 is a wasteful number, since it uses less digits than its factorization.

642187875164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655 (or 5653 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 59.

The spelling of 642187875164 in words is "six hundred forty-two billion, one hundred eighty-seven million, eight hundred seventy-five thousand, one hundred sixty-four".