23666631 has 4 divisors (see below), whose sum is σ = 31555512. Its totient is φ = 15777752.

The previous prime is 23666627. The next prime is 23666677. The reversal of 23666631 is 13666632.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23666631 - 2² = 23666627 is a prime.

It is a super-2 number, since 2×23666631² = 1120218845780322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23666592 and 23666601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23666131) 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, 3944436 + ... + 3944441.

It is an arithmetic number, because the mean of its divisors is an integer number (7888878).

Almost surely, 2^23666631 is an apocalyptic number.

23666631 is a deficient number, since it is larger than the sum of its proper divisors (7888881).

23666631 is an equidigital number, since it uses as much as digits as its factorization.

23666631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7888880.

The product of its digits is 23328, while the sum is 33.

The square root of 23666631 is about 4864.8361740145. The cubic root of 23666631 is about 287.1081229312.

Subtracting from 23666631 its reverse (13666632), we obtain a palindrome (9999999).

The spelling of 23666631 in words is "twenty-three million, six hundred sixty-six thousand, six hundred thirty-one".