18378299520 has 256 divisors, whose sum is σ = 74388844800. Its totient is φ = 4200726528.

The previous prime is 18378299491. The next prime is 18378299549. The reversal of 18378299520 is 2599287381.

18378299520 is a `hidden beast` number, since 1 + 8 + 37 + 82 + 9 + 9 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (18378299491) and next prime (18378299549).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 44992 + ... + 196928.

It is an arithmetic number, because the mean of its divisors is an integer number (290581425).

Almost surely, 2^18378299520 is an apocalyptic number.

18378299520 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 18378299520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37194422400).

18378299520 is an abundant number, since it is smaller than the sum of its proper divisors (56010545280).

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

18378299520 is a wasteful number, since it uses less digits than its factorization.

18378299520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151972 (or 151954 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 18378299520 in words is "eighteen billion, three hundred seventy-eight million, two hundred ninety-nine thousand, five hundred twenty".