25495216717 has 4 divisors (see below), whose sum is σ = 25495538976. Its totient is φ = 25494894460.

The previous prime is 25495216697. The next prime is 25495216751. The reversal of 25495216717 is 71761259452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25495216717 - 2⁷ = 25495216589 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25495216517) 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, 48138 + ... + 230884.

It is an arithmetic number, because the mean of its divisors is an integer number (6373884744).

Almost surely, 2^25495216717 is an apocalyptic number.

It is an amenable number.

25495216717 is a deficient number, since it is larger than the sum of its proper divisors (322259).

25495216717 is a wasteful number, since it uses less digits than its factorization.

25495216717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322258.

The product of its digits is 1058400, while the sum is 49.

The spelling of 25495216717 in words is "twenty-five billion, four hundred ninety-five million, two hundred sixteen thousand, seven hundred seventeen".