25746317521 has 4 divisors (see below), whose sum is σ = 25837294192. Its totient is φ = 25655340852.

The previous prime is 25746317497. The next prime is 25746317533. The reversal of 25746317521 is 12571364752.

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.

It is a cyclic number.

It is not a de Polignac number, because 25746317521 - 2⁷ = 25746317393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25746317591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45487911 + ... + 45488476.

It is an arithmetic number, because the mean of its divisors is an integer number (6459323548).

Almost surely, 2^25746317521 is an apocalyptic number.

It is an amenable number.

25746317521 is a deficient number, since it is larger than the sum of its proper divisors (90976671).

25746317521 is an equidigital number, since it uses as much as digits as its factorization.

25746317521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90976670.

The product of its digits is 352800, while the sum is 43.

The spelling of 25746317521 in words is "twenty-five billion, seven hundred forty-six million, three hundred seventeen thousand, five hundred twenty-one".