25534534240 has 24 divisors (see below), whose sum is σ = 60325337520. Its totient is φ = 10213813632.

The previous prime is 25534534183. The next prime is 25534534247. The reversal of 25534534240 is 4243543552.

It is a self number, because there is not a number n which added to its sum of digits gives 25534534240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25534534247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79795260 + ... + 79795579.

It is an arithmetic number, because the mean of its divisors is an integer number (2513555730).

Almost surely, 2^25534534240 is an apocalyptic number.

25534534240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25534534240 is an abundant number, since it is smaller than the sum of its proper divisors (34790803280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25534534240 is a wasteful number, since it uses less digits than its factorization.

25534534240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159590854 (or 159590846 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 37.

The spelling of 25534534240 in words is "twenty-five billion, five hundred thirty-four million, five hundred thirty-four thousand, two hundred forty".