18916775877 has 16 divisors (see below), whose sum is σ = 26561192960. Its totient is φ = 11942338032.

The previous prime is 18916775863. The next prime is 18916775923. The reversal of 18916775877 is 77857761981.

It is not a de Polignac number, because 18916775877 - 2⁷ = 18916775749 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 (18916775077) 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, 66198 + ... + 205464.

It is an arithmetic number, because the mean of its divisors is an integer number (1660074560).

Almost surely, 2^18916775877 is an apocalyptic number.

It is an amenable number.

18916775877 is a deficient number, since it is larger than the sum of its proper divisors (7644417083).

18916775877 is a wasteful number, since it uses less digits than its factorization.

18916775877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141672.

The product of its digits is 41489280, while the sum is 66.

The spelling of 18916775877 in words is "eighteen billion, nine hundred sixteen million, seven hundred seventy-five thousand, eight hundred seventy-seven".