25641811312 has 80 divisors (see below), whose sum is σ = 55580817600. Its totient is φ = 11383142400.

The previous prime is 25641811301. The next prime is 25641811313. The reversal of 25641811312 is 21311814652.

It is a super-2 number, since 2×25641811312² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641811313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 584314 + ... + 626662.

It is an arithmetic number, because the mean of its divisors is an integer number (694760220).

Almost surely, 2^25641811312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25641811312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27790408800).

25641811312 is an abundant number, since it is smaller than the sum of its proper divisors (29939006288).

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

25641811312 is a wasteful number, since it uses less digits than its factorization.

25641811312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42482 (or 42476 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The spelling of 25641811312 in words is "twenty-five billion, six hundred forty-one million, eight hundred eleven thousand, three hundred twelve".