18668855368777 has 4 divisors (see below), whose sum is σ = 18669862391760. Its totient is φ = 18667848345796.

The previous prime is 18668855368771. The next prime is 18668855368843. The reversal of 18668855368777 is 77786355886681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18668855368777 - 2³⁵ = 18634495630409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18668855368694 and 18668855368703.

It is not an unprimeable number, because it can be changed into a prime (18668855368771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503483683 + ... + 503520760.

It is an arithmetic number, because the mean of its divisors is an integer number (4667465597940).

Almost surely, 2^{18668855368777} is an apocalyptic number.

It is an amenable number.

18668855368777 is a deficient number, since it is larger than the sum of its proper divisors (1007022983).

18668855368777 is a wasteful number, since it uses less digits than its factorization.

18668855368777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007022982.

The product of its digits is 22759833600, while the sum is 85.

The spelling of 18668855368777 in words is "eighteen trillion, six hundred sixty-eight billion, eight hundred fifty-five million, three hundred sixty-eight thousand, seven hundred seventy-seven".