18017956896 has 96 divisors (see below), whose sum is σ = 50142693888. Its totient is φ = 5655121920.

The previous prime is 18017956877. The next prime is 18017956921. The reversal of 18017956896 is 69865971081.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×18017956896² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28296 + ... + 191928.

It is an arithmetic number, because the mean of its divisors is an integer number (522319728).

Almost surely, 2^18017956896 is an apocalyptic number.

18017956896 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 18017956896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25071346944).

18017956896 is an abundant number, since it is smaller than the sum of its proper divisors (32124736992).

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

18017956896 is a wasteful number, since it uses less digits than its factorization.

18017956896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163714 (or 163706 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 18017956896 in words is "eighteen billion, seventeen million, nine hundred fifty-six thousand, eight hundred ninety-six".