23664131665 has 16 divisors (see below), whose sum is σ = 30516141312. Its totient is φ = 17551759104.

The previous prime is 23664131611. The next prime is 23664131669. The reversal of 23664131665 is 56613146632.

It is a cyclic number.

It is not a de Polignac number, because 23664131665 - 2⁷ = 23664131537 is a prime.

It is a super-2 number, since 2×23664131665² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23664131669) 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, 2071929 + ... + 2083318.

It is an arithmetic number, because the mean of its divisors is an integer number (1907258832).

Almost surely, 2^23664131665 is an apocalyptic number.

It is an amenable number.

23664131665 is a deficient number, since it is larger than the sum of its proper divisors (6852009647).

23664131665 is a wasteful number, since it uses less digits than its factorization.

23664131665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155336.

The product of its digits is 466560, while the sum is 43.

The spelling of 23664131665 in words is "twenty-three billion, six hundred sixty-four million, one hundred thirty-one thousand, six hundred sixty-five".