23666663 has 4 divisors (see below), whose sum is σ = 23751168. Its totient is φ = 23582160.

The previous prime is 23666627. The next prime is 23666677. The reversal of 23666663 is 36666632.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23666663 is a prime.

It is a super-2 number, since 2×23666663² = 1120221875111138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23666693) 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, 41831 + ... + 42392.

It is an arithmetic number, because the mean of its divisors is an integer number (5937792).

Almost surely, 2^23666663 is an apocalyptic number.

23666663 is a deficient number, since it is larger than the sum of its proper divisors (84505).

23666663 is an equidigital number, since it uses as much as digits as its factorization.

23666663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84504.

The product of its digits is 139968, while the sum is 38.

The square root of 23666663 is about 4864.8394629217. The cubic root of 23666663 is about 287.1082523322.

The spelling of 23666663 in words is "twenty-three million, six hundred sixty-six thousand, six hundred sixty-three".