18461984072 has 32 divisors (see below), whose sum is σ = 39779987520. Its totient is φ = 7868560320.

The previous prime is 18461984041. The next prime is 18461984129. The reversal of 18461984072 is 27048916481.

It is a self number, because there is not a number n which added to its sum of digits gives 18461984072.

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, 900578 + ... + 920849.

It is an arithmetic number, because the mean of its divisors is an integer number (1243124610).

Almost surely, 2^18461984072 is an apocalyptic number.

It is an amenable number.

18461984072 is an abundant number, since it is smaller than the sum of its proper divisors (21318003448).

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

18461984072 is a wasteful number, since it uses less digits than its factorization.

18461984072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821621 (or 1821617 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 18461984072 in words is "eighteen billion, four hundred sixty-one million, nine hundred eighty-four thousand, seventy-two".