25125012502640 has 80 divisors (see below), whose sum is σ = 61987213805472. Its totient is φ = 9438130348032.

The previous prime is 25125012502637. The next prime is 25125012502661. The reversal of 25125012502640 is 4620521052152.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 25125012502640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19591034 + ... + 20834073.

Almost surely, 2^{25125012502640} is an apocalyptic number.

25125012502640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25125012502640 is an abundant number, since it is smaller than the sum of its proper divisors (36862201302832).

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

25125012502640 is a wasteful number, since it uses less digits than its factorization.

25125012502640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40425594 (or 40425588 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 25125012502640 its reverse (4620521052152), we get a palindrome (29745533554792).

The spelling of 25125012502640 in words is "twenty-five trillion, one hundred twenty-five billion, twelve million, five hundred two thousand, six hundred forty".