225855172418 has 18 divisors (see below), whose sum is σ = 342030312729. Its totient is φ = 111855260232.

The previous prime is 225855172399. The next prime is 225855172421. The reversal of 225855172418 is 814271558522.

It can be written as a sum of positive squares in 2 ways, for example, as 216720974089 + 9134198329 = 465533^2 + 95573^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=336047.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 73256705 + ... + 73259787.

Almost surely, 2^225855172418 is an apocalyptic number.

225855172418 is a deficient number, since it is larger than the sum of its proper divisors (116175140311).

225855172418 is an frugal number, since it uses more digits than its factorization.

225855172418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6386 (or 3194 counting only the distinct ones).

The product of its digits is 1792000, while the sum is 50.

Multiplying 225855172418 by its sum of digits (50), we get a square (11292758620900 = 3360470²).

The spelling of 225855172418 in words is "two hundred twenty-five billion, eight hundred fifty-five million, one hundred seventy-two thousand, four hundred eighteen".