25522816536 has 96 divisors (see below), whose sum is σ = 79068936960. Its totient is φ = 7285795776.

The previous prime is 25522816511. The next prime is 25522816537. The reversal of 25522816536 is 63561822552.

25522816536 is a `hidden beast` number, since 2 + 552 + 2 + 8 + 1 + 65 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25522816491 and 25522816500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25522816537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564381 + ... + 607923.

It is an arithmetic number, because the mean of its divisors is an integer number (823634760).

Almost surely, 2^25522816536 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 25522816536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39534468480).

25522816536 is an abundant number, since it is smaller than the sum of its proper divisors (53546120424).

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

25522816536 is a wasteful number, since it uses less digits than its factorization.

25522816536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44725 (or 44718 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 25522816536 in words is "twenty-five billion, five hundred twenty-two million, eight hundred sixteen thousand, five hundred thirty-six".