25621725696 has 160 divisors (see below), whose sum is σ = 79110079488. Its totient is φ = 7217172480.

The previous prime is 25621725671. The next prime is 25621725709. The reversal of 25621725696 is 69652712652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 746611 + ... + 780173.

Almost surely, 2^25621725696 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 25621725696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39555039744).

25621725696 is an abundant number, since it is smaller than the sum of its proper divisors (53488353792).

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

25621725696 is an equidigital number, since it uses as much as digits as its factorization.

25621725696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33662 (or 33646 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 51.

The spelling of 25621725696 in words is "twenty-five billion, six hundred twenty-one million, seven hundred twenty-five thousand, six hundred ninety-six".