25661742010564 has 81 divisors (see below), whose sum is σ = 52100760775791. Its totient is φ = 11049599080080.

The previous prime is 25661742010549. The next prime is 25661742010591. The reversal of 25661742010564 is 46501024716652.

The square root of 25661742010564 is 5065742.

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

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2117474097 + ... + 2117486215.

Almost surely, 2^{25661742010564} is an apocalyptic number.

25661742010564 is the 5065742-nd square number.

It is an amenable number.

25661742010564 is an abundant number, since it is smaller than the sum of its proper divisors (26439018765227).

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

25661742010564 is an equidigital number, since it uses as much as digits as its factorization.

25661742010564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24302 (or 12151 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 25661742010564 in words is "twenty-five trillion, six hundred sixty-one billion, seven hundred forty-two million, ten thousand, five hundred sixty-four".