23666523553 has 4 divisors (see below), whose sum is σ = 23713020180. Its totient is φ = 23620026928.

The previous prime is 23666523523. The next prime is 23666523571. The reversal of 23666523553 is 35532566632.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20825953344 + 2840570209 = 144312^2 + 53297^2 .

It is a cyclic number.

It is not a de Polignac number, because 23666523553 - 2¹⁷ = 23666392481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23666523523) 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, 23247550 + ... + 23248567.

It is an arithmetic number, because the mean of its divisors is an integer number (5928255045).

Almost surely, 2^23666523553 is an apocalyptic number.

It is an amenable number.

23666523553 is a deficient number, since it is larger than the sum of its proper divisors (46496627).

23666523553 is an equidigital number, since it uses as much as digits as its factorization.

23666523553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46496626.

The product of its digits is 2916000, while the sum is 46.

The spelling of 23666523553 in words is "twenty-three billion, six hundred sixty-six million, five hundred twenty-three thousand, five hundred fifty-three".