18722611616 has 48 divisors (see below), whose sum is σ = 38508934464. Its totient is φ = 8943542784.

The previous prime is 18722611601. The next prime is 18722611627. The reversal of 18722611616 is 61611622781.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615911 + ... + 645593.

It is an arithmetic number, because the mean of its divisors is an integer number (802269468).

Almost surely, 2^18722611616 is an apocalyptic number.

18722611616 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 18722611616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19254467232).

18722611616 is an abundant number, since it is smaller than the sum of its proper divisors (19786322848).

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

18722611616 is a wasteful number, since it uses less digits than its factorization.

18722611616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30573 (or 30565 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The spelling of 18722611616 in words is "eighteen billion, seven hundred twenty-two million, six hundred eleven thousand, six hundred sixteen".