665266122 has 80 divisors (see below), whose sum is σ = 1581541632. Its totient is φ = 208565280.

The previous prime is 665266079. The next prime is 665266139. The reversal of 665266122 is 221662566.

665266122 is a `hidden beast` number, since 6 + 6 + 526 + 6 + 122 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 225823 + ... + 228749.

Almost surely, 2^665266122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665266122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790770816).

665266122 is an abundant number, since it is smaller than the sum of its proper divisors (916275510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665266122 is a wasteful number, since it uses less digits than its factorization.

665266122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3025 (or 3016 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 665266122 is about 25792.7532845953. The cubic root of 665266122 is about 872.9682916177.

The spelling of 665266122 in words is "six hundred sixty-five million, two hundred sixty-six thousand, one hundred twenty-two".