23566681 has 2 divisors, whose sum is σ = 23566682. Its totient is φ = 23566680.

The previous prime is 23566657. The next prime is 23566793. The reversal of 23566681 is 18666532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19219456 + 4347225 = 4384^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 23566681 - 2⁷ = 23566553 is a prime.

It is a super-2 number, since 2×23566681² = 1110776906711522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23566681.

It is not a weakly prime, because it can be changed into another prime (23566601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11783340 + 11783341.

It is an arithmetic number, because the mean of its divisors is an integer number (11783341).

Almost surely, 2^23566681 is an apocalyptic number.

It is an amenable number.

23566681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23566681 is an equidigital number, since it uses as much as digits as its factorization.

23566681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 23566681 is about 4854.5526055446. The cubic root of 23566681 is about 286.7033765559.

The spelling of 23566681 in words is "twenty-three million, five hundred sixty-six thousand, six hundred eighty-one".