18250891440 has 160 divisors (see below), whose sum is σ = 57415866816. Its totient is φ = 4795269120.

The previous prime is 18250891411. The next prime is 18250891441. The reversal of 18250891440 is 4419805281.

It is a junction number, because it is equal to n+sod(n) for n = 18250891392 and 18250891401.

It is not an unprimeable number, because it can be changed into a prime (18250891441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5608854 + ... + 5612106.

Almost surely, 2^18250891440 is an apocalyptic number.

18250891440 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 18250891440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28707933408).

18250891440 is an abundant number, since it is smaller than the sum of its proper divisors (39164975376).

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

18250891440 is a wasteful number, since it uses less digits than its factorization.

18250891440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607 (or 3601 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 18250891440 in words is "eighteen billion, two hundred fifty million, eight hundred ninety-one thousand, four hundred forty".