25454801440 has 96 divisors (see below), whose sum is σ = 61660134144. Its totient is φ = 9925754880.

The previous prime is 25454801399. The next prime is 25454801441. The reversal of 25454801440 is 4410845452.

It is a self number, because there is not a number n which added to its sum of digits gives 25454801440.

It is not an unprimeable number, because it can be changed into a prime (25454801441) 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 15 ways as a sum of consecutive naturals, for example, 1926055 + ... + 1939225.

It is an arithmetic number, because the mean of its divisors is an integer number (642293064).

Almost surely, 2^25454801440 is an apocalyptic number.

25454801440 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 25454801440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30830067072).

25454801440 is an abundant number, since it is smaller than the sum of its proper divisors (36205332704).

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

25454801440 is a wasteful number, since it uses less digits than its factorization.

25454801440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13490 (or 13482 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 37.

The spelling of 25454801440 in words is "twenty-five billion, four hundred fifty-four million, eight hundred one thousand, four hundred forty".