16989819025 has 27 divisors (see below), whose sum is σ = 21336639483. Its totient is φ = 13420321200.

The previous prime is 16989818999. The next prime is 16989819029. The reversal of 16989819025 is 52091898961.

The square root of 16989819025 is 130345.

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

It can be written as a sum of positive squares in only one way, i.e., 6116334849 + 10873484176 = 78207^2 + 104276^2 .

It is not a de Polignac number, because 16989819025 - 2²⁷ = 16855601297 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16989819029) 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, 85375876 + ... + 85376074.

Almost surely, 2^16989819025 is an apocalyptic number.

16989819025 is the 130345-th square number.

16989819025 is the 65173-rd centered octagonal number.

It is an amenable number.

16989819025 is a deficient number, since it is larger than the sum of its proper divisors (4346820458).

16989819025 is an frugal number, since it uses more digits than its factorization.

16989819025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 58.

The spelling of 16989819025 in words is "sixteen billion, nine hundred eighty-nine million, eight hundred nineteen thousand, twenty-five".