16805039366025 has 81 divisors (see below), whose sum is σ = 30563139889191. Its totient is φ = 8826751723680.

The previous prime is 16805039365999. The next prime is 16805039366051. The reversal of 16805039366025 is 52066393050861.

It is a happy number.

The square root of 16805039366025 is 4099395.

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

16805039366025 is a `hidden beast` number, since 1 + 6 + 80 + 503 + 9 + 36 + 6 + 0 + 25 = 666.

It is an interprime number because it is at equal distance from previous prime (16805039365999) and next prime (16805039366051).

It can be written as a sum of positive squares in only one way, i.e., 6049814171769 + 10755225194256 = 2459637^2 + 3279516^2 .

It is not a de Polignac number, because 16805039366025 - 2¹⁷ = 16805039234953 is a prime.

It is a Curzon 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, 4119889936 + ... + 4119894014.

Almost surely, 2^{16805039366025} is an apocalyptic number.

16805039366025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16805039366025 is the 4099395-th square number.

16805039366025 is the 2049698-th centered octagonal number.

It is an amenable number.

16805039366025 is a deficient number, since it is larger than the sum of its proper divisors (13758100523166).

16805039366025 is an frugal number, since it uses more digits than its factorization.

16805039366025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8308 (or 4154 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 16805039366025 in words is "sixteen trillion, eight hundred five billion, thirty-nine million, three hundred sixty-six thousand, twenty-five".