18446317500 has 480 divisors, whose sum is σ = 63483678720. Its totient is φ = 4124160000.

The previous prime is 18446317481. The next prime is 18446317529. The reversal of 18446317500 is 571364481.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 51382321 + ... + 51382679.

It is an arithmetic number, because the mean of its divisors is an integer number (132257664).

Almost surely, 2^18446317500 is an apocalyptic number.

18446317500 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 18446317500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31741839360).

18446317500 is an abundant number, since it is smaller than the sum of its proper divisors (45037361220).

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

18446317500 is a wasteful number, since it uses less digits than its factorization.

18446317500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 18446317500 in words is "eighteen billion, four hundred forty-six million, three hundred seventeen thousand, five hundred".