16256983680025 has 27 divisors (see below), whose sum is σ = 22158167947293. Its totient is φ = 11823099578400.

The previous prime is 16256983680023. The next prime is 16256983680037. The reversal of 16256983680025 is 52008638965261.

The square root of 16256983680025 is 4031995.

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 4815975088089 + 11441008591936 = 2194533^2 + 3382456^2 .

It is not a de Polignac number, because 16256983680025 - 2¹ = 16256983680023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16256983680023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 221723071 + ... + 221796379.

Almost surely, 2^{16256983680025} is an apocalyptic number.

16256983680025 is the 4031995-th square number.

16256983680025 is the 2015998-th centered octagonal number.

It is an amenable number.

16256983680025 is a deficient number, since it is larger than the sum of its proper divisors (5901184267268).

16256983680025 is an frugal number, since it uses more digits than its factorization.

16256983680025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146650 (or 73325 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 16256983680025 in words is "sixteen trillion, two hundred fifty-six billion, nine hundred eighty-three million, six hundred eighty thousand, twenty-five".