161500564 has 12 divisors (see below), whose sum is σ = 282912084. Its totient is φ = 80668544.

The previous prime is 161500543. The next prime is 161500567. The reversal of 161500564 is 465005161.

It can be written as a sum of positive squares in 2 ways, for example, as 71402500 + 90098064 = 8450^2 + 9492^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161500567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15877 + ... + 23980.

It is an arithmetic number, because the mean of its divisors is an integer number (23576007).

Almost surely, 2^161500564 is an apocalyptic number.

It is an amenable number.

161500564 is a deficient number, since it is larger than the sum of its proper divisors (121411520).

161500564 is a wasteful number, since it uses less digits than its factorization.

161500564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40874 (or 40872 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 161500564 is about 12708.2872174027. The cubic root of 161500564 is about 544.5753941050.

The spelling of 161500564 in words is "one hundred sixty-one million, five hundred thousand, five hundred sixty-four".