25144225812 has 18 divisors (see below), whose sum is σ = 63559015338. Its totient is φ = 8381408592.

The previous prime is 25144225811. The next prime is 25144225861. The reversal of 25144225812 is 21852244152.

25144225812 is a `hidden beast` number, since 2 + 51 + 4 + 4 + 22 + 581 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21329434116 + 3814791696 = 146046^2 + 61764^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 698450717 = 25144225812 / (2 + 5 + 1 + 4 + 4 + 2 + 2 + 5 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25144225811) 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 5 ways as a sum of consecutive naturals, for example, 349225323 + ... + 349225394.

Almost surely, 2^25144225812 is an apocalyptic number.

It is an amenable number.

25144225812 is an abundant number, since it is smaller than the sum of its proper divisors (38414789526).

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

25144225812 is a wasteful number, since it uses less digits than its factorization.

25144225812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698450727 (or 698450722 counting only the distinct ones).

The product of its digits is 51200, while the sum is 36.

Adding to 25144225812 its reverse (21852244152), we get a palindrome (46996469964).

The spelling of 25144225812 in words is "twenty-five billion, one hundred forty-four million, two hundred twenty-five thousand, eight hundred twelve".