25715332521 has 10 divisors (see below), whose sum is σ = 38414262282. Its totient is φ = 17143554960.

The previous prime is 25715332499. The next prime is 25715332529. The reversal of 25715332521 is 12523351752.

25715332521 is a `hidden beast` number, since 2 + 5 + 71 + 533 + 2 + 52 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22062943296 + 3652389225 = 148536^2 + 60435^2 .

It is not a de Polignac number, because 25715332521 - 2⁶ = 25715332457 is a prime.

It is a super-2 number, since 2×25715332521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25715332529) 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 9 ways as a sum of consecutive naturals, for example, 158736540 + ... + 158736701.

Almost surely, 2^25715332521 is an apocalyptic number.

It is an amenable number.

25715332521 is a deficient number, since it is larger than the sum of its proper divisors (12698929761).

25715332521 is an equidigital number, since it uses as much as digits as its factorization.

25715332521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317473253 (or 317473244 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The spelling of 25715332521 in words is "twenty-five billion, seven hundred fifteen million, three hundred thirty-two thousand, five hundred twenty-one".