23664568645 has 8 divisors (see below), whose sum is σ = 28398362904. Its totient is φ = 18931067904.

The previous prime is 23664568637. The next prime is 23664568657. The reversal of 23664568645 is 54686546632.

It can be written as a sum of positive squares in 4 ways, for example, as 2519337249 + 21145231396 = 50193^2 + 145414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23664568645 - 2³ = 23664568637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189837 + ... + 288733.

It is an arithmetic number, because the mean of its divisors is an integer number (3549795363).

Almost surely, 2^23664568645 is an apocalyptic number.

It is an amenable number.

23664568645 is a deficient number, since it is larger than the sum of its proper divisors (4733794259).

23664568645 is an equidigital number, since it uses as much as digits as its factorization.

23664568645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146759.

The product of its digits is 24883200, while the sum is 55.

The spelling of 23664568645 in words is "twenty-three billion, six hundred sixty-four million, five hundred sixty-eight thousand, six hundred forty-five".