18761513216 has 72 divisors (see below), whose sum is σ = 39523192800. Its totient is φ = 8863948800.

The previous prime is 18761513213. The next prime is 18761513227. The reversal of 18761513216 is 61231516781.

It is not an unprimeable number, because it can be changed into a prime (18761513213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1945655 + ... + 1955273.

Almost surely, 2^18761513216 is an apocalyptic number.

18761513216 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 18761513216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19761596400).

18761513216 is an abundant number, since it is smaller than the sum of its proper divisors (20761679584).

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

18761513216 is an equidigital number, since it uses as much as digits as its factorization.

18761513216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055 (or 10041 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The spelling of 18761513216 in words is "eighteen billion, seven hundred sixty-one million, five hundred thirteen thousand, two hundred sixteen".