18574843913 has 2 divisors, whose sum is σ = 18574843914. Its totient is φ = 18574843912.

The previous prime is 18574843877. The next prime is 18574843919. The reversal of 18574843913 is 31934847581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16813530889 + 1761313024 = 129667^2 + 41968^2 .

It is a cyclic number.

It is not a de Polignac number, because 18574843913 - 2⁸ = 18574843657 is a prime.

It is not a weakly prime, because it can be changed into another prime (18574843919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9287421956 + 9287421957.

It is an arithmetic number, because the mean of its divisors is an integer number (9287421957).

Almost surely, 2^18574843913 is an apocalyptic number.

It is an amenable number.

18574843913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18574843913 is an equidigital number, since it uses as much as digits as its factorization.

18574843913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The spelling of 18574843913 in words is "eighteen billion, five hundred seventy-four million, eight hundred forty-three thousand, nine hundred thirteen".