25998982564 has 9 divisors (see below), whose sum is σ = 45498783841. Its totient is φ = 12999330040.

The previous prime is 25998982549. The next prime is 25998982571. The reversal of 25998982564 is 46528989952.

The square root of 25998982564 is 161242.

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., 283652964 + 25715329600 = 16842^2 + 160360^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25998982564.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 282174 + ... + 362794.

Almost surely, 2^25998982564 is an apocalyptic number.

25998982564 is the 161242-nd square number.

It is an amenable number.

25998982564 is a deficient number, since it is larger than the sum of its proper divisors (19499801277).

25998982564 is an frugal number, since it uses more digits than its factorization.

25998982564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161246 (or 80623 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 67.

The spelling of 25998982564 in words is "twenty-five billion, nine hundred ninety-eight million, nine hundred eighty-two thousand, five hundred sixty-four".