18255917940 has 96 divisors (see below), whose sum is σ = 55172275200. Its totient is φ = 4483670016.

The previous prime is 18255917909. The next prime is 18255917941. The reversal of 18255917940 is 4971955281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18255917941) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 324157 + ... + 376283.

It is an arithmetic number, because the mean of its divisors is an integer number (574711200).

Almost surely, 2^18255917940 is an apocalyptic number.

18255917940 is a gapful number since it is divisible by the number (10) 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 18255917940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27586137600).

18255917940 is an abundant number, since it is smaller than the sum of its proper divisors (36916357260).

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

18255917940 is a wasteful number, since it uses less digits than its factorization.

18255917940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52601 (or 52599 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 18255917940 in words is "eighteen billion, two hundred fifty-five million, nine hundred seventeen thousand, nine hundred forty".