25555223136 has 96 divisors (see below), whose sum is σ = 70791235200. Its totient is φ = 8049715200.

The previous prime is 25555223119. The next prime is 25555223143. The reversal of 25555223136 is 63132255552.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 25555223094 and 25555223103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 713955 + ... + 748893.

It is an arithmetic number, because the mean of its divisors is an integer number (737408700).

Almost surely, 2^25555223136 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 25555223136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35395617600).

25555223136 is an abundant number, since it is smaller than the sum of its proper divisors (45236012064).

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

25555223136 is a wasteful number, since it uses less digits than its factorization.

25555223136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35372 (or 35364 counting only the distinct ones).

The product of its digits is 270000, while the sum is 39.

Adding to 25555223136 its reverse (63132255552), we get a palindrome (88687478688).

The spelling of 25555223136 in words is "twenty-five billion, five hundred fifty-five million, two hundred twenty-three thousand, one hundred thirty-six".