25505040432 has 160 divisors (see below), whose sum is σ = 71051256000. Its totient is φ = 7855243264.

The previous prime is 25505040403. The next prime is 25505040433. The reversal of 25505040432 is 23404050552.

It is a self number, because there is not a number n which added to its sum of digits gives 25505040432.

It is not an unprimeable number, because it can be changed into a prime (25505040433) 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, 10819798 + ... + 10822154.

It is an arithmetic number, because the mean of its divisors is an integer number (444070350).

Almost surely, 2^25505040432 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 25505040432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35525628000).

25505040432 is an abundant number, since it is smaller than the sum of its proper divisors (45546215568).

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

25505040432 is a wasteful number, since it uses less digits than its factorization.

25505040432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 2617 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

Adding to 25505040432 its reverse (23404050552), we get a palindrome (48909090984).

The spelling of 25505040432 in words is "twenty-five billion, five hundred five million, forty thousand, four hundred thirty-two".