18219922991616 has 80 divisors (see below), whose sum is σ = 48546716052384. Its totient is φ = 6072343916544.

The previous prime is 18219922991581. The next prime is 18219922991659. The reversal of 18219922991616 is 61619922991281.

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, 8774130 + ... + 10650126.

Almost surely, 2^{18219922991616} is an apocalyptic number.

18219922991616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18219922991616 is an abundant number, since it is smaller than the sum of its proper divisors (30326793060768).

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

18219922991616 is an equidigital number, since it uses as much as digits as its factorization.

18219922991616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882341 (or 1882325 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 66.

The spelling of 18219922991616 in words is "eighteen trillion, two hundred nineteen billion, nine hundred twenty-two million, nine hundred ninety-one thousand, six hundred sixteen".