25586561764 has 9 divisors (see below), whose sum is σ = 44777042947. Its totient is φ = 12793120924.

The previous prime is 25586561711. The next prime is 25586561809. The reversal of 25586561764 is 46716568552.

The square root of 25586561764 is 159958.

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

It is a Duffinian number.

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, 279927 + ... + 359905.

Almost surely, 2^25586561764 is an apocalyptic number.

25586561764 is the 159958-th square number.

It is an amenable number.

25586561764 is a deficient number, since it is larger than the sum of its proper divisors (19190481183).

25586561764 is an frugal number, since it uses more digits than its factorization.

25586561764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159962 (or 79981 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 55.

The spelling of 25586561764 in words is "twenty-five billion, five hundred eighty-six million, five hundred sixty-one thousand, seven hundred sixty-four".