2157867315172 has 12 divisors (see below), whose sum is σ = 3776817444736. Its totient is φ = 1078776616680.

The previous prime is 2157867315161. The next prime is 2157867315269. The reversal of 2157867315172 is 2715137687512.

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, 39229308 + ... + 39284275.

Almost surely, 2^{2157867315172} is an apocalyptic number.

It is an amenable number.

2157867315172 is a deficient number, since it is larger than the sum of its proper divisors (1618950129564).

2157867315172 is a wasteful number, since it uses less digits than its factorization.

2157867315172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78520458 (or 78520456 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 55.

The spelling of 2157867315172 in words is "two trillion, one hundred fifty-seven billion, eight hundred sixty-seven million, three hundred fifteen thousand, one hundred seventy-two".