25505422336 has 44 divisors (see below), whose sum is σ = 51119845632. Its totient is φ = 12719218688.

The previous prime is 25505422321. The next prime is 25505422357. The reversal of 25505422336 is 63322450552.

It is a junction number, because it is equal to n+sod(n) for n = 25505422295 and 25505422304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359676 + ... + 424708.

Almost surely, 2^25505422336 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 25505422336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25559922816).

25505422336 is an abundant number, since it is smaller than the sum of its proper divisors (25614423296).

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

25505422336 is an equidigital number, since it uses as much as digits as its factorization.

25505422336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65436 (or 65418 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 37.

Adding to 25505422336 its reverse (63322450552), we get a palindrome (88827872888).

The spelling of 25505422336 in words is "twenty-five billion, five hundred five million, four hundred twenty-two thousand, three hundred thirty-six".