18512442457 has 2 divisors, whose sum is σ = 18512442458. Its totient is φ = 18512442456.

The previous prime is 18512442427. The next prime is 18512442527. The reversal of 18512442457 is 75424421581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17388114496 + 1124327961 = 131864^2 + 33531^2 .

It is a cyclic number.

It is not a de Polignac number, because 18512442457 - 2¹⁹ = 18511918169 is a prime.

It is not a weakly prime, because it can be changed into another prime (18512442427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256221228 + 9256221229.

It is an arithmetic number, because the mean of its divisors is an integer number (9256221229).

Almost surely, 2^18512442457 is an apocalyptic number.

It is an amenable number.

18512442457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512442457 is an equidigital number, since it uses as much as digits as its factorization.

18512442457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 358400, while the sum is 43.

The spelling of 18512442457 in words is "eighteen billion, five hundred twelve million, four hundred forty-two thousand, four hundred fifty-seven".