18464780520 has 256 divisors, whose sum is σ = 66242188800. Its totient is φ = 4558049280.

The previous prime is 18464780497. The next prime is 18464780539. The reversal of 18464780520 is 2508746481.

18464780520 is a `hidden beast` number, since 1 + 8 + 4 + 6 + 47 + 80 + 520 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1111717 + ... + 1128203.

It is an arithmetic number, because the mean of its divisors is an integer number (258758550).

Almost surely, 2^18464780520 is an apocalyptic number.

18464780520 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 18464780520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33121094400).

18464780520 is an abundant number, since it is smaller than the sum of its proper divisors (47777408280).

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

18464780520 is a wasteful number, since it uses less digits than its factorization.

18464780520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16585 (or 16575 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 18464780520 in words is "eighteen billion, four hundred sixty-four million, seven hundred eighty thousand, five hundred twenty".