23531510557 has 2 divisors, whose sum is σ = 23531510558. Its totient is φ = 23531510556.

The previous prime is 23531510479. The next prime is 23531510567. The reversal of 23531510557 is 75501513532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16739443161 + 6792067396 = 129381^2 + 82414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23531510557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23531510567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765755278 + 11765755279.

It is an arithmetic number, because the mean of its divisors is an integer number (11765755279).

Almost surely, 2^23531510557 is an apocalyptic number.

It is an amenable number.

23531510557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23531510557 is an equidigital number, since it uses as much as digits as its factorization.

23531510557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78750, while the sum is 37.

The spelling of 23531510557 in words is "twenty-three billion, five hundred thirty-one million, five hundred ten thousand, five hundred fifty-seven".