25285280525 has 12 divisors (see below), whose sum is σ = 32434912500. Its totient is φ = 19530698880.

The previous prime is 25285280521. The next prime is 25285280561. The reversal of 25285280525 is 52508258252.

It can be written as a sum of positive squares in 6 ways, for example, as 5569189129 + 19716091396 = 74627^2 + 140414^2 .

It is not a de Polignac number, because 25285280525 - 2² = 25285280521 is a prime.

It is a super-2 number, since 2×25285280525² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25285280521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17437400 + ... + 17438849.

It is an arithmetic number, because the mean of its divisors is an integer number (2702909375).

Almost surely, 2^25285280525 is an apocalyptic number.

25285280525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25285280525 is a deficient number, since it is larger than the sum of its proper divisors (7149631975).

25285280525 is a wasteful number, since it uses less digits than its factorization.

25285280525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34876288 (or 34876283 counting only the distinct ones).

The product of its (nonzero) digits is 640000, while the sum is 44.

The spelling of 25285280525 in words is "twenty-five billion, two hundred eighty-five million, two hundred eighty thousand, five hundred twenty-five".