25555998240 has 144 divisors (see below), whose sum is σ = 90023222016. Its totient is φ = 6595084800.

The previous prime is 25555998233. The next prime is 25555998343. The reversal of 25555998240 is 4289955552.

25555998240 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 599 + 8 + 2 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241606 + ... + 330885.

It is an arithmetic number, because the mean of its divisors is an integer number (625161264).

Almost surely, 2^25555998240 is an apocalyptic number.

25555998240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25555998240 is an abundant number, since it is smaller than the sum of its proper divisors (64467223776).

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

25555998240 is a wasteful number, since it uses less digits than its factorization.

25555998240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572543 (or 572532 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 54.

The spelling of 25555998240 in words is "twenty-five billion, five hundred fifty-five million, nine hundred ninety-eight thousand, two hundred forty".