25695716817 has 8 divisors (see below), whose sum is σ = 35750562624. Its totient is φ = 16385674448.

The previous prime is 25695716803. The next prime is 25695716819. The reversal of 25695716817 is 71861759652.

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 25695716817 - 2²³ = 25687328209 is a prime.

It is a super-2 number, since 2×25695716817² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25695716819) 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, 186200778 + ... + 186200915.

It is an arithmetic number, because the mean of its divisors is an integer number (4468820328).

Almost surely, 2^25695716817 is an apocalyptic number.

It is an amenable number.

25695716817 is a deficient number, since it is larger than the sum of its proper divisors (10054845807).

25695716817 is a wasteful number, since it uses less digits than its factorization.

25695716817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372401719.

The product of its digits is 6350400, while the sum is 57.

The spelling of 25695716817 in words is "twenty-five billion, six hundred ninety-five million, seven hundred sixteen thousand, eight hundred seventeen".