18640925520 has 320 divisors, whose sum is σ = 67966649856. Its totient is φ = 4137615360.

The previous prime is 18640925491. The next prime is 18640925533. The reversal of 18640925520 is 2552904681.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19079272 + ... + 19080248.

Almost surely, 2^18640925520 is an apocalyptic number.

18640925520 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 18640925520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33983324928).

18640925520 is an abundant number, since it is smaller than the sum of its proper divisors (49325724336).

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

18640925520 is a wasteful number, since it uses less digits than its factorization.

18640925520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 18640925520 in words is "eighteen billion, six hundred forty million, nine hundred twenty-five thousand, five hundred twenty".