25046512440 has 128 divisors (see below), whose sum is σ = 78039936000. Its totient is φ = 6426080768.

The previous prime is 25046512433. The next prime is 25046512441. The reversal of 25046512440 is 4421564052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25046512441) 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 31 ways as a sum of consecutive naturals, for example, 295126 + ... + 370394.

It is an arithmetic number, because the mean of its divisors is an integer number (609687000).

Almost surely, 2^25046512440 is an apocalyptic number.

25046512440 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 25046512440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39019968000).

25046512440 is an abundant number, since it is smaller than the sum of its proper divisors (52993423560).

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

25046512440 is a wasteful number, since it uses less digits than its factorization.

25046512440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75389 (or 75385 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

The spelling of 25046512440 in words is "twenty-five billion, forty-six million, five hundred twelve thousand, four hundred forty".