161216275572 has 72 divisors (see below), whose sum is σ = 444876606720. Its totient is φ = 48819294720.

The previous prime is 161216275537. The next prime is 161216275609. The reversal of 161216275572 is 275572612161.

161216275572 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 1 + 6 + 2 + 75 + 572 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 428388 + ... + 711300.

It is an arithmetic number, because the mean of its divisors is an integer number (6178841760).

Almost surely, 2^161216275572 is an apocalyptic number.

161216275572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161216275572 is an abundant number, since it is smaller than the sum of its proper divisors (283660331148).

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

161216275572 is a wasteful number, since it uses less digits than its factorization.

161216275572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284373 (or 284368 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The spelling of 161216275572 in words is "one hundred sixty-one billion, two hundred sixteen million, two hundred seventy-five thousand, five hundred seventy-two".