161656904 has 32 divisors (see below), whose sum is σ = 314496000. Its totient is φ = 77808192.

The previous prime is 161656897. The next prime is 161656907. The reversal of 161656904 is 409656161.

It is a super-2 number, since 2×161656904² = 52265909221730432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161656907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96377 + ... + 98039.

It is an arithmetic number, because the mean of its divisors is an integer number (9828000).

Almost surely, 2^161656904 is an apocalyptic number.

It is an amenable number.

161656904 is a deficient number, since it is larger than the sum of its proper divisors (152839096).

161656904 is a wasteful number, since it uses less digits than its factorization.

161656904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117 (or 2113 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 161656904 is about 12714.4368337729. The cubic root of 161656904 is about 544.7510621377.

The spelling of 161656904 in words is "one hundred sixty-one million, six hundred fifty-six thousand, nine hundred four".