23557443857 has 2 divisors, whose sum is σ = 23557443858. Its totient is φ = 23557443856.

The previous prime is 23557443781. The next prime is 23557443859. The reversal of 23557443857 is 75834475532.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14989349761 + 8568094096 = 122431^2 + 92564^2 .

It is a cyclic number.

It is not a de Polignac number, because 23557443857 - 2¹⁶ = 23557378321 is a prime.

It is a super-2 number, since 2×23557443857² (a number of 22 digits) contains 22 as substring.

Together with 23557443859, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23557443799 and 23557443808.

It is not a weakly prime, because it can be changed into another prime (23557443859) by changing a digit.

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 as a sum of consecutive naturals, namely, 11778721928 + 11778721929.

It is an arithmetic number, because the mean of its divisors is an integer number (11778721929).

Almost surely, 2^23557443857 is an apocalyptic number.

It is an amenable number.

23557443857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23557443857 is an equidigital number, since it uses as much as digits as its factorization.

23557443857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112000, while the sum is 53.

The spelling of 23557443857 in words is "twenty-three billion, five hundred fifty-seven million, four hundred forty-three thousand, eight hundred fifty-seven".