161406564 has 24 divisors (see below), whose sum is σ = 410853408. Its totient is φ = 48911040.

The previous prime is 161406529. The next prime is 161406587. The reversal of 161406564 is 465604161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611257 + ... + 611520.

It is an arithmetic number, because the mean of its divisors is an integer number (17118892).

Almost surely, 2^161406564 is an apocalyptic number.

It is an amenable number.

161406564 is an abundant number, since it is smaller than the sum of its proper divisors (249446844).

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

161406564 is a wasteful number, since it uses less digits than its factorization.

161406564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222795 (or 1222793 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 161406564 is about 12704.5883050180. The cubic root of 161406564 is about 544.4697184744.

The spelling of 161406564 in words is "one hundred sixty-one million, four hundred six thousand, five hundred sixty-four".