25408799640 has 96 divisors (see below), whose sum is σ = 94375550880. Its totient is φ = 5807725056.

The previous prime is 25408799609. The next prime is 25408799651. The reversal of 25408799640 is 4699780452.

25408799640 is a `hidden beast` number, since 2 + 540 + 8 + 7 + 9 + 96 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5038909 + ... + 5043948.

It is an arithmetic number, because the mean of its divisors is an integer number (983078655).

Almost surely, 2^25408799640 is an apocalyptic number.

25408799640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25408799640 is an abundant number, since it is smaller than the sum of its proper divisors (68966751240).

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

25408799640 is a wasteful number, since it uses less digits than its factorization.

25408799640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082881 (or 10082874 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 25408799640 in words is "twenty-five billion, four hundred eight million, seven hundred ninety-nine thousand, six hundred forty".