23566251621 has 16 divisors (see below), whose sum is σ = 34924944960. Its totient is φ = 14013093120.

The previous prime is 23566251619. The next prime is 23566251629. The reversal of 23566251621 is 12615266532.

It is not a de Polignac number, because 23566251621 - 2¹ = 23566251619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23566251621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23566251629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6735316 + ... + 6738813.

It is an arithmetic number, because the mean of its divisors is an integer number (2182809060).

Almost surely, 2^23566251621 is an apocalyptic number.

It is an amenable number.

23566251621 is a deficient number, since it is larger than the sum of its proper divisors (11358693339).

23566251621 is a wasteful number, since it uses less digits than its factorization.

23566251621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13474196.

The product of its digits is 129600, while the sum is 39.

The spelling of 23566251621 in words is "twenty-three billion, five hundred sixty-six million, two hundred fifty-one thousand, six hundred twenty-one".