225661715 has 4 divisors (see below), whose sum is σ = 270794064. Its totient is φ = 180529368.

The previous prime is 225661699. The next prime is 225661729. The reversal of 225661715 is 517166522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517166522 = 2 ⋅258583261.

It is a cyclic number.

It is not a de Polignac number, because 225661715 - 2⁴ = 225661699 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, 22566167 + ... + 22566176.

It is an arithmetic number, because the mean of its divisors is an integer number (67698516).

Almost surely, 2^225661715 is an apocalyptic number.

225661715 is a deficient number, since it is larger than the sum of its proper divisors (45132349).

225661715 is an equidigital number, since it uses as much as digits as its factorization.

225661715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45132348.

The product of its digits is 25200, while the sum is 35.

The square root of 225661715 is about 15022.0409731834. The cubic root of 225661715 is about 608.8158655210.

The spelling of 225661715 in words is "two hundred twenty-five million, six hundred sixty-one thousand, seven hundred fifteen".