25811032540 has 24 divisors (see below), whose sum is σ = 54310949280. Its totient is φ = 10303883328.

The previous prime is 25811032529. The next prime is 25811032601. The reversal of 25811032540 is 4523011852.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1272795 + ... + 1292914.

It is an arithmetic number, because the mean of its divisors is an integer number (2262956220).

Almost surely, 2^25811032540 is an apocalyptic number.

25811032540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25811032540 is an abundant number, since it is smaller than the sum of its proper divisors (28499916740).

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

25811032540 is a wasteful number, since it uses less digits than its factorization.

25811032540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566221 (or 2566219 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 25811032540 in words is "twenty-five billion, eight hundred eleven million, thirty-two thousand, five hundred forty".