225215555 has 4 divisors (see below), whose sum is σ = 270258672. Its totient is φ = 180172440.

The previous prime is 225215539. The next prime is 225215561. The reversal of 225215555 is 555512522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555512522 = 2 ⋅277756261.

It is not a de Polignac number, because 225215555 - 2⁴ = 225215539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22521551 + ... + 22521560.

It is an arithmetic number, because the mean of its divisors is an integer number (67564668).

Almost surely, 2^225215555 is an apocalyptic number.

225215555 is a deficient number, since it is larger than the sum of its proper divisors (45043117).

225215555 is an equidigital number, since it uses as much as digits as its factorization.

225215555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45043116.

The product of its digits is 25000, while the sum is 32.

The square root of 225215555 is about 15007.1834466032. The cubic root of 225215555 is about 608.4143670540.

The spelling of 225215555 in words is "two hundred twenty-five million, two hundred fifteen thousand, five hundred fifty-five".