161664156 has 36 divisors (see below), whose sum is σ = 411268312. Its totient is φ = 53542944.

The previous prime is 161664149. The next prime is 161664193. The reversal of 161664156 is 651466161.

It is a happy number.

161664156 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 641 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161664156² = 52270598670384672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161664156.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8650 + ... + 19953.

Almost surely, 2^161664156 is an apocalyptic number.

It is an amenable number.

161664156 is an abundant number, since it is smaller than the sum of its proper divisors (249604156).

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

161664156 is a wasteful number, since it uses less digits than its factorization.

161664156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28770 (or 28765 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 161664156 is about 12714.7220181961. The cubic root of 161664156 is about 544.7592079402.

The spelling of 161664156 in words is "one hundred sixty-one million, six hundred sixty-four thousand, one hundred fifty-six".