18447055867 has 2 divisors, whose sum is σ = 18447055868. Its totient is φ = 18447055866.

The previous prime is 18447055853. The next prime is 18447055871. The reversal of 18447055867 is 76855074481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18447055867 - 2¹¹ = 18447053819 is a prime.

It is not a weakly prime, because it can be changed into another prime (18447055807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9223527933 + 9223527934.

It is an arithmetic number, because the mean of its divisors is an integer number (9223527934).

Almost surely, 2^18447055867 is an apocalyptic number.

18447055867 is a deficient number, since it is larger than the sum of its proper divisors (1).

18447055867 is an equidigital number, since it uses as much as digits as its factorization.

18447055867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 18447055867 in words is "eighteen billion, four hundred forty-seven million, fifty-five thousand, eight hundred sixty-seven".