665164266 has 32 divisors (see below), whose sum is σ = 1439894400. Its totient is φ = 203632704.

The previous prime is 665164259. The next prime is 665164267. The reversal of 665164266 is 662461566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665164267) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5905 + ... + 36948.

It is an arithmetic number, because the mean of its divisors is an integer number (44996700).

Almost surely, 2^665164266 is an apocalyptic number.

665164266 is an abundant number, since it is smaller than the sum of its proper divisors (774730134).

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

665164266 is a wasteful number, since it uses less digits than its factorization.

665164266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43070.

The product of its digits is 311040, while the sum is 42.

The square root of 665164266 is about 25790.7787009233. The cubic root of 665164266 is about 872.9237372187.

The spelling of 665164266 in words is "six hundred sixty-five million, one hundred sixty-four thousand, two hundred sixty-six".