25578397285081 has 3 divisors (see below), whose sum is σ = 25578402342591. Its totient is φ = 25578392227572.

The previous prime is 25578397285073. The next prime is 25578397285093. The reversal of 25578397285081 is 18058279387552.

It is a happy number.

The square root of 25578397285081 is 5057509.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 474088708681 + 25104308576400 = 688541^2 + 5010420^2 .

It is not a de Polignac number, because 25578397285081 - 2³ = 25578397285073 is a prime.

It is a super-2 number, since 2×25578397285081² (a number of 28 digits) contains 22 as substring.

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 25578397285081.

It is not an unprimeable number, because it can be changed into a prime (25578397285981) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2528755 + ... + 7586263.

It is an arithmetic number, because the mean of its divisors is an integer number (8526134114197).

Almost surely, 2^{25578397285081} is an apocalyptic number.

25578397285081 is the 5057509-th square number.

25578397285081 is the 2528755-th centered octagonal number.

It is an amenable number.

25578397285081 is a deficient number, since it is larger than the sum of its proper divisors (5057510).

25578397285081 is an frugal number, since it uses more digits than its factorization.

25578397285081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115018 (or 5057509 counting only the distinct ones).

The product of its (nonzero) digits is 338688000, while the sum is 70.

The spelling of 25578397285081 in words is "twenty-five trillion, five hundred seventy-eight billion, three hundred ninety-seven million, two hundred eighty-five thousand, eighty-one".