16991749120 has 88 divisors (see below), whose sum is σ = 41530010904. Its totient is φ = 6668353536.

The previous prime is 16991749111. The next prime is 16991749139. The reversal of 16991749120 is 2194719961.

It can be written as a sum of positive squares in 4 ways, for example, as 220463104 + 16771286016 = 14848^2 + 129504^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240052 + ... + 302668.

Almost surely, 2^16991749120 is an apocalyptic number.

16991749120 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 16991749120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20765005452).

16991749120 is an abundant number, since it is smaller than the sum of its proper divisors (24538261784).

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

16991749120 is an equidigital number, since it uses as much as digits as its factorization.

16991749120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62695 (or 62677 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 49.

The spelling of 16991749120 in words is "sixteen billion, nine hundred ninety-one million, seven hundred forty-nine thousand, one hundred twenty".