18505580496 has 80 divisors (see below), whose sum is σ = 51753354240. Its totient is φ = 5664176640.

The previous prime is 18505580447. The next prime is 18505580501. The reversal of 18505580496 is 69408550581.

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 15 ways as a sum of consecutive naturals, for example, 41550 + ... + 196818.

It is an arithmetic number, because the mean of its divisors is an integer number (646916928).

Almost surely, 2^18505580496 is an apocalyptic number.

18505580496 is a gapful number since it is divisible by the number (16) 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 18505580496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25876677120).

18505580496 is an abundant number, since it is smaller than the sum of its proper divisors (33247773744).

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

18505580496 is a wasteful number, since it uses less digits than its factorization.

18505580496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155484 (or 155478 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 51.

The spelling of 18505580496 in words is "eighteen billion, five hundred five million, five hundred eighty thousand, four hundred ninety-six".