18516776780 has 24 divisors (see below), whose sum is σ = 40139594880. Its totient is φ = 7167784320.

The previous prime is 18516776779. The next prime is 18516776797. The reversal of 18516776780 is 8767761581.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14932265 + ... + 14933504.

It is an arithmetic number, because the mean of its divisors is an integer number (1672483120).

Almost surely, 2^18516776780 is an apocalyptic number.

18516776780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18516776780 is an abundant number, since it is smaller than the sum of its proper divisors (21622818100).

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

18516776780 is a wasteful number, since it uses less digits than its factorization.

18516776780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29865809 (or 29865807 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 18516776780 in words is "eighteen billion, five hundred sixteen million, seven hundred seventy-six thousand, seven hundred eighty".