18425539440 has 960 divisors, whose sum is σ = 81293082624. Its totient is φ = 3628800000.

The previous prime is 18425539439. The next prime is 18425539477. The reversal of 18425539440 is 4493552481.

18425539440 is a `hidden beast` number, since 1 + 8 + 4 + 2 + 553 + 94 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 122023365 + ... + 122023515.

Almost surely, 2^18425539440 is an apocalyptic number.

18425539440 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 18425539440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40646541312).

18425539440 is an abundant number, since it is smaller than the sum of its proper divisors (62867543184).

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

18425539440 is a wasteful number, since it uses less digits than its factorization.

18425539440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 18425539440 in words is "eighteen billion, four hundred twenty-five million, five hundred thirty-nine thousand, four hundred forty".