18109077980 has 72 divisors (see below), whose sum is σ = 45433600128. Its totient is φ = 6041008512.

The previous prime is 18109077967. The next prime is 18109077997. The reversal of 18109077980 is 8977090181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213452 + ... + 285971.

It is an arithmetic number, because the mean of its divisors is an integer number (631022224).

Almost surely, 2^18109077980 is an apocalyptic number.

18109077980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18109077980 is an abundant number, since it is smaller than the sum of its proper divisors (27324522148).

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

18109077980 is a wasteful number, since it uses less digits than its factorization.

18109077980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499483 (or 499474 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 50.

The spelling of 18109077980 in words is "eighteen billion, one hundred nine million, seventy-seven thousand, nine hundred eighty".