18437217216 has 336 divisors, whose sum is σ = 55918668960. Its totient is φ = 5352652800.

The previous prime is 18437217193. The next prime is 18437217221. The reversal of 18437217216 is 61271273481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76502856 + ... + 76503096.

It is an arithmetic number, because the mean of its divisors is an integer number (166424610).

Almost surely, 2^18437217216 is an apocalyptic number.

18437217216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18437217216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27959334480).

18437217216 is an abundant number, since it is smaller than the sum of its proper divisors (37481451744).

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

18437217216 is a wasteful number, since it uses less digits than its factorization.

18437217216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 383 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The spelling of 18437217216 in words is "eighteen billion, four hundred thirty-seven million, two hundred seventeen thousand, two hundred sixteen".