225515203173 has 24 divisors (see below), whose sum is σ = 352564284800. Its totient is φ = 138081192480.

The previous prime is 225515203153. The next prime is 225515203183. The reversal of 225515203173 is 371302515522.

225515203173 is a `hidden beast` number, since 2 + 2 + 551 + 5 + 2 + 0 + 31 + 73 = 666.

It is not a de Polignac number, because 225515203173 - 2¹⁶ = 225515137637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225515203153) 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, 4819633 + ... + 4866198.

Almost surely, 2^225515203173 is an apocalyptic number.

It is an amenable number.

225515203173 is a deficient number, since it is larger than the sum of its proper divisors (127049081627).

225515203173 is a wasteful number, since it uses less digits than its factorization.

225515203173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9686049 (or 9686046 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

Adding to 225515203173 its reverse (371302515522), we get a palindrome (596817718695).

The spelling of 225515203173 in words is "two hundred twenty-five billion, five hundred fifteen million, two hundred three thousand, one hundred seventy-three".