18979654788 has 18 divisors (see below), whose sum is σ = 47976349694. Its totient is φ = 6326551584.

The previous prime is 18979654787. The next prime is 18979654801. The reversal of 18979654788 is 88745697981.

18979654788 is a `hidden beast` number, since 1 + 8 + 9 + 79 + 6 + 547 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18140857344 + 838797444 = 134688^2 + 28962^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (18979654787) 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, 263606281 + ... + 263606352.

Almost surely, 2^18979654788 is an apocalyptic number.

18979654788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18979654788 is an abundant number, since it is smaller than the sum of its proper divisors (28996694906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18979654788 is a wasteful number, since it uses less digits than its factorization.

18979654788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527212643 (or 527212638 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 72.

The spelling of 18979654788 in words is "eighteen billion, nine hundred seventy-nine million, six hundred fifty-four thousand, seven hundred eighty-eight".