25251216517 has 8 divisors (see below), whose sum is σ = 26416840320. Its totient is φ = 24091238160.

The previous prime is 25251216511. The next prime is 25251216521. The reversal of 25251216517 is 71561215252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25251216517 is a prime.

It is a super-2 number, since 2×25251216517² (a number of 22 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 (25251216511) 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, 1402209 + ... + 1420102.

It is an arithmetic number, because the mean of its divisors is an integer number (3302105040).

Almost surely, 2^25251216517 is an apocalyptic number.

It is an amenable number.

25251216517 is a deficient number, since it is larger than the sum of its proper divisors (1165623803).

25251216517 is a wasteful number, since it uses less digits than its factorization.

25251216517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822723.

The product of its digits is 42000, while the sum is 37.

The spelling of 25251216517 in words is "twenty-five billion, two hundred fifty-one million, two hundred sixteen thousand, five hundred seventeen".