225218785 has 32 divisors (see below), whose sum is σ = 306633600. Its totient is φ = 157301760.

The previous prime is 225218767. The next prime is 225218801. The reversal of 225218785 is 587812522.

It is not a de Polignac number, because 225218785 - 2¹⁹ = 224694497 is a prime.

It is a super-2 number, since 2×225218785² = 101447002233752450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 537306 + ... + 537724.

It is an arithmetic number, because the mean of its divisors is an integer number (9582300).

Almost surely, 2^225218785 is an apocalyptic number.

It is an amenable number.

225218785 is a deficient number, since it is larger than the sum of its proper divisors (81414815).

225218785 is a wasteful number, since it uses less digits than its factorization.

225218785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801.

The product of its digits is 89600, while the sum is 40.

The square root of 225218785 is about 15007.2910613475. The cubic root of 225218785 is about 608.4172756290.

The spelling of 225218785 in words is "two hundred twenty-five million, two hundred eighteen thousand, seven hundred eighty-five".