23900660561 has 4 divisors (see below), whose sum is σ = 24724821300. Its totient is φ = 23076499824.

The previous prime is 23900660549. The next prime is 23900660569. The reversal of 23900660561 is 16506600932.

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 9752747536 + 14147913025 = 98756^2 + 118945^2 .

It is a cyclic number.

It is not a de Polignac number, because 23900660561 - 2¹⁴ = 23900644177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23900660569) 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, 412080326 + ... + 412080383.

It is an arithmetic number, because the mean of its divisors is an integer number (6181205325).

Almost surely, 2^23900660561 is an apocalyptic number.

It is an amenable number.

23900660561 is a deficient number, since it is larger than the sum of its proper divisors (824160739).

23900660561 is an equidigital number, since it uses as much as digits as its factorization.

23900660561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824160738.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 23900660561 in words is "twenty-three billion, nine hundred million, six hundred sixty thousand, five hundred sixty-one".