25215545440 has 48 divisors (see below), whose sum is σ = 59685828048. Its totient is φ = 10066899456.

The previous prime is 25215545431. The next prime is 25215545441. The reversal of 25215545440 is 4454551252.

It is a self number, because there is not a number n which added to its sum of digits gives 25215545440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215545441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66987 + ... + 234346.

It is an arithmetic number, because the mean of its divisors is an integer number (1243454751).

Almost surely, 2^25215545440 is an apocalyptic number.

25215545440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25215545440 is an abundant number, since it is smaller than the sum of its proper divisors (34470282608).

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

25215545440 is a wasteful number, since it uses less digits than its factorization.

25215545440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301871 (or 301863 counting only the distinct ones).

The product of its (nonzero) digits is 160000, while the sum is 37.

The spelling of 25215545440 in words is "twenty-five billion, two hundred fifteen million, five hundred forty-five thousand, four hundred forty".