23156661 has 16 divisors (see below), whose sum is σ = 34467840. Its totient is φ = 13707120.

The previous prime is 23156641. The next prime is 23156671. The reversal of 23156661 is 16665132.

It is not a de Polignac number, because 23156661 - 2⁵ = 23156629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23156621) 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, 6741 + ... + 9578.

It is an arithmetic number, because the mean of its divisors is an integer number (2154240).

Almost surely, 2^23156661 is an apocalyptic number.

It is an amenable number.

23156661 is a deficient number, since it is larger than the sum of its proper divisors (11311179).

23156661 is a wasteful number, since it uses less digits than its factorization.

23156661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16376.

The product of its digits is 6480, while the sum is 30.

The square root of 23156661 is about 4812.1368434408. The cubic root of 23156661 is about 285.0309230836.

The spelling of 23156661 in words is "twenty-three million, one hundred fifty-six thousand, six hundred sixty-one".