25635041797 has 8 divisors (see below), whose sum is σ = 25819175000. Its totient is φ = 25451172864.

The previous prime is 25635041791. The next prime is 25635041833. The reversal of 25635041797 is 79714053652.

It can be written as a sum of positive squares in 4 ways, for example, as 2040238561 + 23594803236 = 45169^2 + 153606^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(25635041797) divides (25635041797-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 25635041797 - 2⁷ = 25635041669 is a prime.

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 25635041797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25635041791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130729 + ... + 261457.

It is an arithmetic number, because the mean of its divisors is an integer number (3227396875).

It is a Poulet number, since it divides 2^25635041796-1.

Almost surely, 2^25635041797 is an apocalyptic number.

25635041797 is the 130729-th pentagonal number.

It is an amenable number.

25635041797 is a deficient number, since it is larger than the sum of its proper divisors (184133203).

25635041797 is a wasteful number, since it uses less digits than its factorization.

25635041797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132135.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 25635041797 in words is "twenty-five billion, six hundred thirty-five million, forty-one thousand, seven hundred ninety-seven".