18777766117 has 16 divisors (see below), whose sum is σ = 20635459200. Its totient is φ = 16945344000.

The previous prime is 18777766081. The next prime is 18777766151. The reversal of 18777766117 is 71166777781.

It is a cyclic number.

It is not a de Polignac number, because 18777766117 - 2⁷ = 18777765989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18777766187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2908509 + ... + 2914957.

It is an arithmetic number, because the mean of its divisors is an integer number (1289716200).

Almost surely, 2^18777766117 is an apocalyptic number.

It is an amenable number.

18777766117 is a deficient number, since it is larger than the sum of its proper divisors (1857693083).

18777766117 is a wasteful number, since it uses less digits than its factorization.

18777766117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8364.

The product of its digits is 4840416, while the sum is 58.

The spelling of 18777766117 in words is "eighteen billion, seven hundred seventy-seven million, seven hundred sixty-six thousand, one hundred seventeen".