16981445931025 has 81 divisors (see below), whose sum is σ = 21872353974003. Its totient is φ = 13078604764800.

The previous prime is 16981445930987. The next prime is 16981445931031. The reversal of 16981445931025 is 52013954418961.

The square root of 16981445931025 is 4120855.

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

It can be written as a sum of positive squares in 13 ways, for example, as 12194294473089 + 4787151457936 = 3492033^2 + 2187956^2 .

It is not a de Polignac number, because 16981445931025 - 2¹⁵ = 16981445898257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 74154785611 + ... + 74154785839.

Almost surely, 2^{16981445931025} is an apocalyptic number.

16981445931025 is the 4120855-th square number.

16981445931025 is the 2060428-th centered octagonal number.

It is an amenable number.

16981445931025 is a deficient number, since it is larger than the sum of its proper divisors (4890908042978).

16981445931025 is an frugal number, since it uses more digits than its factorization.

16981445931025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 16981445931025 in words is "sixteen trillion, nine hundred eighty-one billion, four hundred forty-five million, nine hundred thirty-one thousand, twenty-five".