25438963856571 has 48 divisors (see below), whose sum is σ = 37141699046400. Its totient is φ = 16777471455360.

The previous prime is 25438963856539. The next prime is 25438963856587. The reversal of 25438963856571 is 17565836983452.

25438963856571 is a `hidden beast` number, since 2 + 5 + 4 + 38 + 96 + 385 + 65 + 71 = 666.

It is not a de Polignac number, because 25438963856571 - 2⁵ = 25438963856539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25438963856571.

It is not an unprimeable number, because it can be changed into a prime (25438963858571) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 309348766 + ... + 309430988.

It is an arithmetic number, because the mean of its divisors is an integer number (773785396800).

Almost surely, 2^{25438963856571} is an apocalyptic number.

25438963856571 is a deficient number, since it is larger than the sum of its proper divisors (11702735189829).

25438963856571 is a wasteful number, since it uses less digits than its factorization.

25438963856571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83416 (or 83413 counting only the distinct ones).

The product of its digits is 1306368000, while the sum is 72.

The spelling of 25438963856571 in words is "twenty-five trillion, four hundred thirty-eight billion, nine hundred sixty-three million, eight hundred fifty-six thousand, five hundred seventy-one".