18364779877 has 2 divisors, whose sum is σ = 18364779878. Its totient is φ = 18364779876.

The previous prime is 18364779827. The next prime is 18364779913. The reversal of 18364779877 is 77897746381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16733750881 + 1631028996 = 129359^2 + 40386^2 .

It is a cyclic number.

It is not a de Polignac number, because 18364779877 - 2⁷ = 18364779749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18364779817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182389938 + 9182389939.

It is an arithmetic number, because the mean of its divisors is an integer number (9182389939).

Almost surely, 2^18364779877 is an apocalyptic number.

It is an amenable number.

18364779877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18364779877 is an equidigital number, since it uses as much as digits as its factorization.

18364779877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99574272, while the sum is 67.

The spelling of 18364779877 in words is "eighteen billion, three hundred sixty-four million, seven hundred seventy-nine thousand, eight hundred seventy-seven".