25394539440 has 80 divisors (see below), whose sum is σ = 78895673568. Its totient is φ = 6757029888.

The previous prime is 25394539439. The next prime is 25394539441. The reversal of 25394539440 is 4493549352.

It is an interprime number because it is at equal distance from previous prime (25394539439) and next prime (25394539441).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 25394539440.

It is not an unprimeable number, because it can be changed into a prime (25394539441) 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 15 ways as a sum of consecutive naturals, for example, 6087 + ... + 225446.

Almost surely, 2^25394539440 is an apocalyptic number.

25394539440 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 25394539440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39447836784).

25394539440 is an abundant number, since it is smaller than the sum of its proper divisors (53501134128).

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

25394539440 is a wasteful number, since it uses less digits than its factorization.

25394539440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232006 (or 232000 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 25394539440 in words is "twenty-five billion, three hundred ninety-four million, five hundred thirty-nine thousand, four hundred forty".