23209164561 has 16 divisors (see below), whose sum is σ = 33764060160. Its totient is φ = 14063962320.

The previous prime is 23209164521. The next prime is 23209164569. The reversal of 23209164561 is 16546190232.

It is not a de Polignac number, because 23209164561 - 2⁶ = 23209164497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23209164569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173620 + ... + 276698.

It is an arithmetic number, because the mean of its divisors is an integer number (2110253760).

Almost surely, 2^23209164561 is an apocalyptic number.

It is an amenable number.

23209164561 is a deficient number, since it is larger than the sum of its proper divisors (10554895599).

23209164561 is a wasteful number, since it uses less digits than its factorization.

23209164561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109916.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 23209164561 in words is "twenty-three billion, two hundred nine million, one hundred sixty-four thousand, five hundred sixty-one".