161971764224 has 44 divisors (see below), whose sum is σ = 340826728200. Its totient is φ = 76723458048.

The previous prime is 161971764217. The next prime is 161971764233. The reversal of 161971764224 is 422467179161.

It is a congruent number.

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, 4143059 + ... + 4181970.

Almost surely, 2^161971764224 is an apocalyptic number.

It is an amenable number.

161971764224 is an abundant number, since it is smaller than the sum of its proper divisors (178854963976).

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

161971764224 is an equidigital number, since it uses as much as digits as its factorization.

161971764224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325068 (or 8325050 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 50.

The spelling of 161971764224 in words is "one hundred sixty-one billion, nine hundred seventy-one million, seven hundred sixty-four thousand, two hundred twenty-four".