23966921857 has 2 divisors, whose sum is σ = 23966921858. Its totient is φ = 23966921856.

The previous prime is 23966921837. The next prime is 23966921921. The reversal of 23966921857 is 75812966932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12752959041 + 11213962816 = 112929^2 + 105896^2 .

It is a cyclic number.

It is not a de Polignac number, because 23966921857 - 2⁷ = 23966921729 is a prime.

It is not a weakly prime, because it can be changed into another prime (23966921837) 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, 11983460928 + 11983460929.

It is an arithmetic number, because the mean of its divisors is an integer number (11983460929).

Almost surely, 2^23966921857 is an apocalyptic number.

It is an amenable number.

23966921857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23966921857 is an equidigital number, since it uses as much as digits as its factorization.

23966921857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9797760, while the sum is 58.

The spelling of 23966921857 in words is "twenty-three billion, nine hundred sixty-six million, nine hundred twenty-one thousand, eight hundred fifty-seven".