23566649 has 4 divisors (see below), whose sum is σ = 23621760. Its totient is φ = 23511540.

The previous prime is 23566637. The next prime is 23566657. The reversal of 23566649 is 94666532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23566649 - 2²⁰ = 22518073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23566549) 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, 26909 + ... + 27770.

It is an arithmetic number, because the mean of its divisors is an integer number (5905440).

Almost surely, 2^23566649 is an apocalyptic number.

It is an amenable number.

23566649 is a deficient number, since it is larger than the sum of its proper divisors (55111).

23566649 is an equidigital number, since it uses as much as digits as its factorization.

23566649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55110.

The product of its digits is 233280, while the sum is 41.

The square root of 23566649 is about 4854.5493096682. The cubic root of 23566649 is about 286.7032467892.

The spelling of 23566649 in words is "twenty-three million, five hundred sixty-six thousand, six hundred forty-nine".