18408273644544 has 176 divisors, whose sum is σ = 57589528459008. Its totient is φ = 5117357703168.

The previous prime is 18408273644491. The next prime is 18408273644591. The reversal of 18408273644544 is 44544637280481.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

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, 10772454 + ... + 12363749.

Almost surely, 2^{18408273644544} is an apocalyptic number.

18408273644544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18408273644544 is an abundant number, since it is smaller than the sum of its proper divisors (39181254814464).

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

18408273644544 is a wasteful number, since it uses less digits than its factorization.

18408273644544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23136270 (or 23136252 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 60.

The spelling of 18408273644544 in words is "eighteen trillion, four hundred eight billion, two hundred seventy-three million, six hundred forty-four thousand, five hundred forty-four".