161659564 has 12 divisors (see below), whose sum is σ = 308622888. Its totient is φ = 73481600.

The previous prime is 161659523. The next prime is 161659567. The reversal of 161659564 is 465956161.

161659564 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 2×161659564² = 52267629265340192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161659564.

It is not an unprimeable number, because it can be changed into a prime (161659567) 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, 1836997 + ... + 1837084.

It is an arithmetic number, because the mean of its divisors is an integer number (25718574).

Almost surely, 2^161659564 is an apocalyptic number.

It is an amenable number.

161659564 is a deficient number, since it is larger than the sum of its proper divisors (146963324).

161659564 is a wasteful number, since it uses less digits than its factorization.

161659564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674096 (or 3674094 counting only the distinct ones).

The product of its digits is 194400, while the sum is 43.

The square root of 161659564 is about 12714.5414388408. The cubic root of 161659564 is about 544.7540500086.

The spelling of 161659564 in words is "one hundred sixty-one million, six hundred fifty-nine thousand, five hundred sixty-four".