18005817936 has 160 divisors (see below), whose sum is σ = 49268596608. Its totient is φ = 5658992640.

The previous prime is 18005817919. The next prime is 18005817941. The reversal of 18005817936 is 63971850081.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10461556 + ... + 10463276.

Almost surely, 2^18005817936 is an apocalyptic number.

18005817936 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 18005817936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24634298304).

18005817936 is an abundant number, since it is smaller than the sum of its proper divisors (31262778672).

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

18005817936 is a wasteful number, since it uses less digits than its factorization.

18005817936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 18005817936 in words is "eighteen billion, five million, eight hundred seventeen thousand, nine hundred thirty-six".