25275496440 has 128 divisors (see below), whose sum is σ = 78208312320. Its totient is φ = 6531264000.

The previous prime is 25275496423. The next prime is 25275496471. The reversal of 25275496440 is 4469457252.

It is a self number, because there is not a number n which added to its sum of digits gives 25275496440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 547455 + ... + 591825.

It is an arithmetic number, because the mean of its divisors is an integer number (611002440).

Almost surely, 2^25275496440 is an apocalyptic number.

25275496440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25275496440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39104156160).

25275496440 is an abundant number, since it is smaller than the sum of its proper divisors (52932815880).

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

25275496440 is a wasteful number, since it uses less digits than its factorization.

25275496440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44533 (or 44529 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 25275496440 in words is "twenty-five billion, two hundred seventy-five million, four hundred ninety-six thousand, four hundred forty".