25812553440 has 48 divisors (see below), whose sum is σ = 81309544848. Its totient is φ = 6883347456.

The previous prime is 25812553439. The next prime is 25812553451. The reversal of 25812553440 is 4435521852.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26887597 + ... + 26888556.

It is an arithmetic number, because the mean of its divisors is an integer number (1693948851).

Almost surely, 2^25812553440 is an apocalyptic number.

25812553440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25812553440 is an abundant number, since it is smaller than the sum of its proper divisors (55496991408).

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

25812553440 is a wasteful number, since it uses less digits than its factorization.

25812553440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53776171 (or 53776163 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 39.

The spelling of 25812553440 in words is "twenty-five billion, eight hundred twelve million, five hundred fifty-three thousand, four hundred forty".