25661272256717 has 8 divisors (see below), whose sum is σ = 25682778401280. Its totient is φ = 25639767186480.

The previous prime is 25661272256707. The next prime is 25661272256743. The reversal of 25661272256717 is 71765227216652.

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

It is a cyclic number.

It is not a de Polignac number, because 25661272256717 - 2⁴ = 25661272256701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661272256707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51729659 + ... + 52223367.

It is an arithmetic number, because the mean of its divisors is an integer number (3210347300160).

Almost surely, 2^{25661272256717} is an apocalyptic number.

It is an amenable number.

25661272256717 is a deficient number, since it is larger than the sum of its proper divisors (21506144563).

25661272256717 is a wasteful number, since it uses less digits than its factorization.

25661272256717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537163.

The product of its digits is 29635200, while the sum is 59.

The spelling of 25661272256717 in words is "twenty-five trillion, six hundred sixty-one billion, two hundred seventy-two million, two hundred fifty-six thousand, seven hundred seventeen".