25698978581056 has 105 divisors (see below), whose sum is σ = 56106416836345. Its totient is φ = 11679123357440.

The previous prime is 25698978581041. The next prime is 25698978581153. The reversal of 25698978581056 is 65018587989652.

The square root of 25698978581056 is 5069416.

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., 21995724801600 + 3703253779456 = 4689960^2 + 1924384^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4907192070 + ... + 4907197306.

Almost surely, 2^{25698978581056} is an apocalyptic number.

25698978581056 is the 5069416-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25698978581056

25698978581056 is an abundant number, since it is smaller than the sum of its proper divisors (30407438255289).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25698978581056 is an frugal number, since it uses more digits than its factorization.

25698978581056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10530 (or 5250 counting only the distinct ones).

The product of its (nonzero) digits is 2612736000, while the sum is 79.

The spelling of 25698978581056 in words is "twenty-five trillion, six hundred ninety-eight billion, nine hundred seventy-eight million, five hundred eighty-one thousand, fifty-six".