161856928256 has 40 divisors (see below), whose sum is σ = 323572309764. Its totient is φ = 80884776960.

The previous prime is 161856928231. The next prime is 161856928297. The reversal of 161856928256 is 652829658161.

It can be written as a sum of positive squares in 2 ways, for example, as 94381670656 + 67475257600 = 307216^2 + 259760^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161856928195 and 161856928204.

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, 874586 + ... + 1043366.

Almost surely, 2^161856928256 is an apocalyptic number.

161856928256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161856928256 is a deficient number, since it is larger than the sum of its proper divisors (161715381508).

161856928256 is an equidigital number, since it uses as much as digits as its factorization.

161856928256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170672 (or 170656 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 59.

The spelling of 161856928256 in words is "one hundred sixty-one billion, eight hundred fifty-six million, nine hundred twenty-eight thousand, two hundred fifty-six".