156686994980 has 24 divisors (see below), whose sum is σ = 329050325688. Its totient is φ = 62673343488.

The previous prime is 156686994967. The next prime is 156686995021. The reversal of 156686994980 is 89499686651.

It can be written as a sum of positive squares in 4 ways, for example, as 22468810816 + 134218184164 = 149896^2 + 366358^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1347722 + ... + 1459358.

It is an arithmetic number, because the mean of its divisors is an integer number (13710430237).

Almost surely, 2^156686994980 is an apocalyptic number.

156686994980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156686994980 is an abundant number, since it is smaller than the sum of its proper divisors (172363330708).

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

156686994980 is a wasteful number, since it uses less digits than its factorization.

156686994980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181823 (or 181821 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 71.

The spelling of 156686994980 in words is "one hundred fifty-six billion, six hundred eighty-six million, nine hundred ninety-four thousand, nine hundred eighty".