25806898656 has 576 divisors, whose sum is σ = 100538081280. Its totient is φ = 6071915520.

The previous prime is 25806898627. The next prime is 25806898703. The reversal of 25806898656 is 65689860852.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 25806898593 and 25806898602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9689581 + ... + 9692243.

It is an arithmetic number, because the mean of its divisors is an integer number (174545280).

Almost surely, 2^25806898656 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 25806898656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50269040640).

25806898656 is an abundant number, since it is smaller than the sum of its proper divisors (74731182624).

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

25806898656 is a wasteful number, since it uses less digits than its factorization.

25806898656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2728 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 25806898656 in words is "twenty-five billion, eight hundred six million, eight hundred ninety-eight thousand, six hundred fifty-six".