166537156864 has 36 divisors (see below), whose sum is σ = 357994844956. Its totient is φ = 76863301632.

The previous prime is 166537156783. The next prime is 166537156913. The reversal of 166537156864 is 468651735661.

It can be written as a sum of positive squares in 2 ways, for example, as 80992606464 + 85544550400 = 284592^2 + 292480^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166537156799 and 166537156808.

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, 25017279 + ... + 25023934.

Almost surely, 2^166537156864 is an apocalyptic number.

It is an amenable number.

166537156864 is an abundant number, since it is smaller than the sum of its proper divisors (191457688092).

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

166537156864 is an equidigital number, since it uses as much as digits as its factorization.

166537156864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50041242 (or 50041228 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 58.

The spelling of 166537156864 in words is "one hundred sixty-six billion, five hundred thirty-seven million, one hundred fifty-six thousand, eight hundred sixty-four".