16991614720 has 72 divisors (see below), whose sum is σ = 40726168560. Its totient is φ = 6792314880.

The previous prime is 16991614697. The next prime is 16991614729. The reversal of 16991614720 is 2741619961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16991614729) 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, 2660491 + ... + 2666869.

It is an arithmetic number, because the mean of its divisors is an integer number (565641230).

Almost surely, 2^16991614720 is an apocalyptic number.

16991614720 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 16991614720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20363084280).

16991614720 is an abundant number, since it is smaller than the sum of its proper divisors (23734553840).

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

16991614720 is an equidigital number, since it uses as much as digits as its factorization.

16991614720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8481 (or 8467 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 16991614720 in words is "sixteen billion, nine hundred ninety-one million, six hundred fourteen thousand, seven hundred twenty".