25157125517 has 4 divisors (see below), whose sum is σ = 25157452320. Its totient is φ = 25156798716.

The previous prime is 25157125493. The next prime is 25157125547. The reversal of 25157125517 is 71552175152.

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 25157125517 - 2¹⁸ = 25156863373 is a prime.

It is a super-3 number, since 3×25157125517³ (a number of 32 digits) contains 333 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 (25157125547) 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, 22784 + ... + 225462.

It is an arithmetic number, because the mean of its divisors is an integer number (6289363080).

Almost surely, 2^25157125517 is an apocalyptic number.

It is an amenable number.

25157125517 is a deficient number, since it is larger than the sum of its proper divisors (326803).

25157125517 is a wasteful number, since it uses less digits than its factorization.

25157125517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326802.

The product of its digits is 122500, while the sum is 41.

The spelling of 25157125517 in words is "twenty-five billion, one hundred fifty-seven million, one hundred twenty-five thousand, five hundred seventeen".