25431243525 has 72 divisors (see below), whose sum is σ = 46207399680. Its totient is φ = 13368251520.

The previous prime is 25431243479. The next prime is 25431243547. The reversal of 25431243525 is 52534213452.

25431243525 is a `hidden beast` number, since 2 + 5 + 4 + 3 + 124 + 3 + 525 = 666.

It is not a de Polignac number, because 25431243525 - 2⁸ = 25431243269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25431243525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15765619 + ... + 15767231.

It is an arithmetic number, because the mean of its divisors is an integer number (641769440).

Almost surely, 2^25431243525 is an apocalyptic number.

25431243525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25431243525 is a deficient number, since it is larger than the sum of its proper divisors (20776156155).

25431243525 is a wasteful number, since it uses less digits than its factorization.

25431243525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595 (or 2587 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

Adding to 25431243525 its reverse (52534213452), we get a palindrome (77965456977).

The spelling of 25431243525 in words is "twenty-five billion, four hundred thirty-one million, two hundred forty-three thousand, five hundred twenty-five".