18446806380 has 48 divisors (see below), whose sum is σ = 53896760064. Its totient is φ = 4705272000.

The previous prime is 18446806379. The next prime is 18446806397. The reversal of 18446806380 is 8360864481.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6682246 + ... + 6685005.

It is an arithmetic number, because the mean of its divisors is an integer number (1122849168).

Almost surely, 2^18446806380 is an apocalyptic number.

18446806380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18446806380 is an abundant number, since it is smaller than the sum of its proper divisors (35449953684).

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

18446806380 is a wasteful number, since it uses less digits than its factorization.

18446806380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13367286 (or 13367284 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 18446806380 in words is "eighteen billion, four hundred forty-six million, eight hundred six thousand, three hundred eighty".