161915446971 has 12 divisors (see below), whose sum is σ = 234676089648. Its totient is φ = 107575221264.

The previous prime is 161915446939. The next prime is 161915446997. The reversal of 161915446971 is 179644519161.

161915446971 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 1 + 544 + 6 + 97 + 1 = 666.

It is not a de Polignac number, because 161915446971 - 2⁵ = 161915446939 is a prime.

It is a super-3 number, since 3×161915446971³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (161915442971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30698055 + ... + 30703328.

It is an arithmetic number, because the mean of its divisors is an integer number (19556340804).

Almost surely, 2^161915446971 is an apocalyptic number.

161915446971 is a deficient number, since it is larger than the sum of its proper divisors (72760642677).

161915446971 is a wasteful number, since it uses less digits than its factorization.

161915446971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61401682 (or 61401679 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The spelling of 161915446971 in words is "one hundred sixty-one billion, nine hundred fifteen million, four hundred forty-six thousand, nine hundred seventy-one".