161656664 has 16 divisors (see below), whose sum is σ = 326422320. Its totient is φ = 74610720.

The previous prime is 161656639. The next prime is 161656667. The reversal of 161656664 is 466656161.

161656664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161656664² = 52265754031217792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161656667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777092 + ... + 777299.

It is an arithmetic number, because the mean of its divisors is an integer number (20401395).

Almost surely, 2^161656664 is an apocalyptic number.

It is an amenable number.

161656664 is an abundant number, since it is smaller than the sum of its proper divisors (164765656).

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

161656664 is a wasteful number, since it uses less digits than its factorization.

161656664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554410 (or 1554406 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 161656664 is about 12714.4273956793. The cubic root of 161656664 is about 544.7507925538.

The spelling of 161656664 in words is "one hundred sixty-one million, six hundred fifty-six thousand, six hundred sixty-four".