18217601408 has 64 divisors (see below), whose sum is σ = 37653422400. Its totient is φ = 8769159168.

The previous prime is 18217601393. The next prime is 18217601411. The reversal of 18217601408 is 80410671281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 1303385 + ... + 1317287.

It is an arithmetic number, because the mean of its divisors is an integer number (588334725).

Almost surely, 2^18217601408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18217601408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18826711200).

18217601408 is an abundant number, since it is smaller than the sum of its proper divisors (19435820992).

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

18217601408 is a wasteful number, since it uses less digits than its factorization.

18217601408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14299 (or 14287 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 38.

The spelling of 18217601408 in words is "eighteen billion, two hundred seventeen million, six hundred one thousand, four hundred eight".