161509564 has 12 divisors (see below), whose sum is σ = 282731904. Its totient is φ = 80729024.

The previous prime is 161509561. The next prime is 161509577. The reversal of 161509564 is 465905161.

161509564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161509561) 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, 17829 + ... + 25315.

It is an arithmetic number, because the mean of its divisors is an integer number (23560992).

Almost surely, 2^161509564 is an apocalyptic number.

It is an amenable number.

161509564 is a deficient number, since it is larger than the sum of its proper divisors (121222340).

161509564 is a wasteful number, since it uses less digits than its factorization.

161509564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12884 (or 12882 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 161509564 is about 12708.6413121152. The cubic root of 161509564 is about 544.5855098334.

The spelling of 161509564 in words is "one hundred sixty-one million, five hundred nine thousand, five hundred sixty-four".