18456474899 has 2 divisors, whose sum is σ = 18456474900. Its totient is φ = 18456474898.

The previous prime is 18456474893. The next prime is 18456474937. The reversal of 18456474899 is 99847465481.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18456474899 is a prime.

It is not a weakly prime, because it can be changed into another prime (18456474893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9228237449 + 9228237450.

It is an arithmetic number, because the mean of its divisors is an integer number (9228237450).

Almost surely, 2^18456474899 is an apocalyptic number.

18456474899 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456474899 is an equidigital number, since it uses as much as digits as its factorization.

18456474899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69672960, while the sum is 65.

The spelling of 18456474899 in words is "eighteen billion, four hundred fifty-six million, four hundred seventy-four thousand, eight hundred ninety-nine".