161317278760 has 64 divisors (see below), whose sum is σ = 397360054080. Its totient is φ = 58453501440.

The previous prime is 161317278697. The next prime is 161317278827. The reversal of 161317278760 is 67872713161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523237 + ... + 772276.

It is an arithmetic number, because the mean of its divisors is an integer number (6208750845).

Almost surely, 2^161317278760 is an apocalyptic number.

161317278760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161317278760 is an abundant number, since it is smaller than the sum of its proper divisors (236042775320).

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

161317278760 is a wasteful number, since it uses less digits than its factorization.

161317278760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295818 (or 1295814 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 49.

The spelling of 161317278760 in words is "one hundred sixty-one billion, three hundred seventeen million, two hundred seventy-eight thousand, seven hundred sixty".