25638956727287 has 4 divisors (see below), whose sum is σ = 25639122837240. Its totient is φ = 25638790617336.

The previous prime is 25638956727283. The next prime is 25638956727323. The reversal of 25638956727287 is 78272765983652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25638956727287 - 2² = 25638956727283 is a prime.

It is a super-2 number, since 2×25638956727287² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25638956727283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82823237 + ... + 83132222.

It is an arithmetic number, because the mean of its divisors is an integer number (6409780709310).

Almost surely, 2^{25638956727287} is an apocalyptic number.

25638956727287 is a deficient number, since it is larger than the sum of its proper divisors (166109953).

25638956727287 is a wasteful number, since it uses less digits than its factorization.

25638956727287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166109952.

The product of its digits is 4267468800, while the sum is 77.

The spelling of 25638956727287 in words is "twenty-five trillion, six hundred thirty-eight billion, nine hundred fifty-six million, seven hundred twenty-seven thousand, two hundred eighty-seven".