18123615780 has 24 divisors (see below), whose sum is σ = 50746124352. Its totient is φ = 4832964192.

The previous prime is 18123615779. The next prime is 18123615787. The reversal of 18123615780 is 8751632181.

It is not an unprimeable number, because it can be changed into a prime (18123615787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151030072 + ... + 151030191.

It is an arithmetic number, because the mean of its divisors is an integer number (2114421848).

Almost surely, 2^18123615780 is an apocalyptic number.

18123615780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18123615780 is an abundant number, since it is smaller than the sum of its proper divisors (32622508572).

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

18123615780 is a wasteful number, since it uses less digits than its factorization.

18123615780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302060275 (or 302060273 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 18123615780 in words is "eighteen billion, one hundred twenty-three million, six hundred fifteen thousand, seven hundred eighty".