25505313111102 has 128 divisors (see below), whose sum is σ = 57965832437760. Its totient is φ = 7473359493600.

The previous prime is 25505313111079. The next prime is 25505313111127. The reversal of 25505313111102 is 20111131350552.

It is a self number, because there is not a number n which added to its sum of digits gives 25505313111102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 302731099 + ... + 302815337.

It is an arithmetic number, because the mean of its divisors is an integer number (452858065920).

Almost surely, 2^{25505313111102} is an apocalyptic number.

25505313111102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25505313111102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28982916218880).

25505313111102 is an abundant number, since it is smaller than the sum of its proper divisors (32460519326658).

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

25505313111102 is a wasteful number, since it uses less digits than its factorization.

25505313111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85531 (or 85509 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

Adding to 25505313111102 its reverse (20111131350552), we get a palindrome (45616444461654).

The spelling of 25505313111102 in words is "twenty-five trillion, five hundred five billion, three hundred thirteen million, one hundred eleven thousand, one hundred two".