25116981633571 has 4 divisors (see below), whose sum is σ = 25365664620144. Its totient is φ = 24868298647000.

The previous prime is 25116981633559. The next prime is 25116981633577. The reversal of 25116981633571 is 17533618961152.

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 25116981633571 - 2¹⁵ = 25116981600803 is a prime.

It is a super-2 number, since 2×25116981633571² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25116981633577) 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, 124341493135 + ... + 124341493336.

It is an arithmetic number, because the mean of its divisors is an integer number (6341416155036).

Almost surely, 2^{25116981633571} is an apocalyptic number.

25116981633571 is a deficient number, since it is larger than the sum of its proper divisors (248682986573).

25116981633571 is a wasteful number, since it uses less digits than its factorization.

25116981633571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248682986572.

The product of its digits is 8164800, while the sum is 58.

The spelling of 25116981633571 in words is "twenty-five trillion, one hundred sixteen billion, nine hundred eighty-one million, six hundred thirty-three thousand, five hundred seventy-one".