25613406644 has 96 divisors (see below), whose sum is σ = 53396496384. Its totient is φ = 10519839360.

The previous prime is 25613406641. The next prime is 25613406649. The reversal of 25613406644 is 44660431652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25613406641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73813679 + ... + 73814025.

It is an arithmetic number, because the mean of its divisors is an integer number (556213504).

Almost surely, 2^25613406644 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 25613406644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26698248192).

25613406644 is an abundant number, since it is smaller than the sum of its proper divisors (27783089740).

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

25613406644 is a wasteful number, since it uses less digits than its factorization.

25613406644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 25613406644 in words is "twenty-five billion, six hundred thirteen million, four hundred six thousand, six hundred forty-four".