18467722816 has 21 divisors (see below), whose sum is σ = 36649044939. Its totient is φ = 9233317824.

The previous prime is 18467722813. The next prime is 18467722817. The reversal of 18467722816 is 61822776481.

The square root of 18467722816 is 135896.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18467722813) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1078675 + ... + 1095661.

Almost surely, 2^18467722816 is an apocalyptic number.

18467722816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18467722816 is the 135896-th square number.

It is an amenable number.

18467722816 is a deficient number, since it is larger than the sum of its proper divisors (18181322123).

18467722816 is an frugal number, since it uses more digits than its factorization.

18467722816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33986 (or 16989 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 52.

The spelling of 18467722816 in words is "eighteen billion, four hundred sixty-seven million, seven hundred twenty-two thousand, eight hundred sixteen".