665256226 has 32 divisors (see below), whose sum is σ = 1048522752. Its totient is φ = 316249920.

The previous prime is 665256217. The next prime is 665256233. The reversal of 665256226 is 622652566.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666760 + ... + 667756.

It is an arithmetic number, because the mean of its divisors is an integer number (32766336).

Almost surely, 2^665256226 is an apocalyptic number.

665256226 is a deficient number, since it is larger than the sum of its proper divisors (383266526).

665256226 is a wasteful number, since it uses less digits than its factorization.

665256226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234.

The product of its digits is 259200, while the sum is 40.

The square root of 665256226 is about 25792.5614470529. The cubic root of 665256226 is about 872.9639630556.

The spelling of 665256226 in words is "six hundred sixty-five million, two hundred fifty-six thousand, two hundred twenty-six".