23557321517 has 2 divisors, whose sum is σ = 23557321518. Its totient is φ = 23557321516.

The previous prime is 23557321457. The next prime is 23557321537. The reversal of 23557321517 is 71512375532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23138668996 + 418652521 = 152114^2 + 20461^2 .

It is a cyclic number.

It is not a de Polignac number, because 23557321517 - 2¹⁸ = 23557059373 is a prime.

It is a super-2 number, since 2×23557321517² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23557321537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11778660758 + 11778660759.

It is an arithmetic number, because the mean of its divisors is an integer number (11778660759).

Almost surely, 2^23557321517 is an apocalyptic number.

It is an amenable number.

23557321517 is a deficient number, since it is larger than the sum of its proper divisors (1).

23557321517 is an equidigital number, since it uses as much as digits as its factorization.

23557321517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 220500, while the sum is 41.

The spelling of 23557321517 in words is "twenty-three billion, five hundred fifty-seven million, three hundred twenty-one thousand, five hundred seventeen".