18978080876 has 12 divisors (see below), whose sum is σ = 33212607960. Its totient is φ = 9488764320.

The previous prime is 18978080857. The next prime is 18978080879. The reversal of 18978080876 is 67808087981.

It is not an unprimeable number, because it can be changed into a prime (18978080879) 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, 221171 + ... + 294741.

It is an arithmetic number, because the mean of its divisors is an integer number (2767717330).

Almost surely, 2^18978080876 is an apocalyptic number.

It is an amenable number.

18978080876 is a deficient number, since it is larger than the sum of its proper divisors (14234527084).

18978080876 is a wasteful number, since it uses less digits than its factorization.

18978080876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138064 (or 138062 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 62.

The spelling of 18978080876 in words is "eighteen billion, nine hundred seventy-eight million, eighty thousand, eight hundred seventy-six".