161756564 has 12 divisors (see below), whose sum is σ = 299725524. Its totient is φ = 76120704.

The previous prime is 161756561. The next prime is 161756579. The reversal of 161756564 is 465657161.

161756564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 113592964 + 48163600 = 10658^2 + 6940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161756561) 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, 1189319 + ... + 1189454.

It is an arithmetic number, because the mean of its divisors is an integer number (24977127).

Almost surely, 2^161756564 is an apocalyptic number.

It is an amenable number.

161756564 is a deficient number, since it is larger than the sum of its proper divisors (137968960).

161756564 is a wasteful number, since it uses less digits than its factorization.

161756564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378794 (or 2378792 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 161756564 is about 12718.3553968271. The cubic root of 161756564 is about 544.8629838207.

The spelling of 161756564 in words is "one hundred sixty-one million, seven hundred fifty-six thousand, five hundred sixty-four".