25256440000 has 280 divisors, whose sum is σ = 69515010576. Its totient is φ = 9024000000.

The previous prime is 25256439979. The next prime is 25256440007. The reversal of 25256440000 is 4465252.

It is a super-2 number, since 2×25256440000² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25256440007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26839530 + ... + 26840470.

Almost surely, 2^25256440000 is an apocalyptic number.

25256440000 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 25256440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34757505288).

25256440000 is an abundant number, since it is smaller than the sum of its proper divisors (44258570576).

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

25256440000 is an equidigital number, since it uses as much as digits as its factorization.

25256440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The spelling of 25256440000 in words is "twenty-five billion, two hundred fifty-six million, four hundred forty thousand".