225594475218 has 126 divisors (see below), whose sum is σ = 590521336821. Its totient is φ = 64419292224.

The previous prime is 225594475217. The next prime is 225594475229. The reversal of 225594475218 is 812574495522.

225594475218 is a `hidden beast` number, since 2 + 2 + 5 + 594 + 47 + 5 + 2 + 1 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 225584151849 + 10323369 = 474957^2 + 3213^2 .

It is a tau number, because it is divible by the number of its divisors (126).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=335853.

It is a super-2 number, since 2×225594475218² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (225594475213) 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 62 ways as a sum of consecutive naturals, for example, 126951546 + ... + 126953322.

Almost surely, 2^225594475218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225594475218

225594475218 is an abundant number, since it is smaller than the sum of its proper divisors (364926861603).

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

225594475218 is an frugal number, since it uses more digits than its factorization.

225594475218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588 (or 1789 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 225594475218 in words is "two hundred twenty-five billion, five hundred ninety-four million, four hundred seventy-five thousand, two hundred eighteen".