18456474937 has 2 divisors, whose sum is σ = 18456474938. Its totient is φ = 18456474936.

The previous prime is 18456474899. The next prime is 18456474989. The reversal of 18456474937 is 73947465481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10374644736 + 8081830201 = 101856^2 + 89899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18456474937 is a prime.

It is not a weakly prime, because it can be changed into another prime (18456474137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9228237468 + 9228237469.

It is an arithmetic number, because the mean of its divisors is an integer number (9228237469).

Almost surely, 2^18456474937 is an apocalyptic number.

It is an amenable number.

18456474937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456474937 is an equidigital number, since it uses as much as digits as its factorization.

18456474937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 58.

The spelling of 18456474937 in words is "eighteen billion, four hundred fifty-six million, four hundred seventy-four thousand, nine hundred thirty-seven".