18750777161 has 4 divisors (see below), whose sum is σ = 18788055552. Its totient is φ = 18713498772.

The previous prime is 18750777077. The next prime is 18750777187. The reversal of 18750777161 is 16177705781.

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 18750777161 - 2²² = 18746582857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18750777191) 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, 18638441 + ... + 18639446.

It is an arithmetic number, because the mean of its divisors is an integer number (4697013888).

Almost surely, 2^18750777161 is an apocalyptic number.

It is an amenable number.

18750777161 is a deficient number, since it is larger than the sum of its proper divisors (37278391).

18750777161 is an equidigital number, since it uses as much as digits as its factorization.

18750777161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37278390.

The product of its (nonzero) digits is 576240, while the sum is 50.

The spelling of 18750777161 in words is "eighteen billion, seven hundred fifty million, seven hundred seventy-seven thousand, one hundred sixty-one".