25011212112 has 120 divisors (see below), whose sum is σ = 71062605224. Its totient is φ = 8210460672.

The previous prime is 25011212111. The next prime is 25011212129. The reversal of 25011212112 is 21121211052.

It can be written as a sum of positive squares in 4 ways, for example, as 16557512976 + 8453699136 = 128676^2 + 91944^2 .

It is a super-2 number, since 2×25011212112² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25011212111) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9217668 + ... + 9220380.

Almost surely, 2^25011212112 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 25011212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35531302612).

25011212112 is an abundant number, since it is smaller than the sum of its proper divisors (46051393112).

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

25011212112 is a wasteful number, since it uses less digits than its factorization.

25011212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677 (or 3668 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 25011212112 its reverse (21121211052), we get a palindrome (46132423164).

The spelling of 25011212112 in words is "twenty-five billion, eleven million, two hundred twelve thousand, one hundred twelve".