25655221116 has 72 divisors (see below), whose sum is σ = 75221328000. Its totient is φ = 7220654496.

The previous prime is 25655221099. The next prime is 25655221117. The reversal of 25655221116 is 61112255652.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25655221117) 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, 742866 + ... + 776633.

Almost surely, 2^25655221116 is an apocalyptic number.

It is an amenable number.

25655221116 is an abundant number, since it is smaller than the sum of its proper divisors (49566106884).

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

25655221116 is a wasteful number, since it uses less digits than its factorization.

25655221116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519583 (or 1519578 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

Adding to 25655221116 its reverse (61112255652), we get a palindrome (86767476768).

The spelling of 25655221116 in words is "twenty-five billion, six hundred fifty-five million, two hundred twenty-one thousand, one hundred sixteen".