18555061779 has 6 divisors (see below), whose sum is σ = 26801755916. Its totient is φ = 12370041180.

The previous prime is 18555061771. The next prime is 18555061907. The reversal of 18555061779 is 97716055581.

It is a happy number.

18555061779 is a `hidden beast` number, since 1 + 8 + 5 + 550 + 6 + 17 + 79 = 666.

It is not a de Polignac number, because 18555061779 - 2³ = 18555061771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18555061771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030836757 + ... + 1030836774.

Almost surely, 2^18555061779 is an apocalyptic number.

18555061779 is a deficient number, since it is larger than the sum of its proper divisors (8246694137).

18555061779 is a wasteful number, since it uses less digits than its factorization.

18555061779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061673537 (or 2061673534 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 54.

The spelling of 18555061779 in words is "eighteen billion, five hundred fifty-five million, sixty-one thousand, seven hundred seventy-nine".