18456474137 has 2 divisors, whose sum is σ = 18456474138. Its totient is φ = 18456474136.

The previous prime is 18456474119. The next prime is 18456474151. The reversal of 18456474137 is 73147465481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16971836176 + 1484637961 = 130276^2 + 38531^2 .

It is a cyclic number.

It is not a de Polignac number, because 18456474137 - 2⁸ = 18456473881 is a prime.

It is not a weakly prime, because it can be changed into another prime (18456474937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9228237068 + 9228237069.

It is an arithmetic number, because the mean of its divisors is an integer number (9228237069).

Almost surely, 2^18456474137 is an apocalyptic number.

It is an amenable number.

18456474137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456474137 is an equidigital number, since it uses as much as digits as its factorization.

18456474137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 50.

The spelling of 18456474137 in words is "eighteen billion, four hundred fifty-six million, four hundred seventy-four thousand, one hundred thirty-seven".