16991383201 has 27 divisors (see below), whose sum is σ = 18979696953. Its totient is φ = 15204140640.

The previous prime is 16991383187. The next prime is 16991383219. The reversal of 16991383201 is 10238319961.

The square root of 16991383201 is 130351.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 70576801 + 16920806400 = 8401^2 + 130080^2 .

It is not a de Polignac number, because 16991383201 - 2³³ = 8401448609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16991383231) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 62698696 + ... + 62698966.

It is an arithmetic number, because the mean of its divisors is an integer number (702951739).

Almost surely, 2^16991383201 is an apocalyptic number.

16991383201 is the 130351-st square number.

16991383201 is the 65176-th centered octagonal number.

It is an amenable number.

16991383201 is a deficient number, since it is larger than the sum of its proper divisors (1988313752).

16991383201 is an frugal number, since it uses more digits than its factorization.

16991383201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 16991383201 in words is "sixteen billion, nine hundred ninety-one million, three hundred eighty-three thousand, two hundred one".