665171612 has 12 divisors (see below), whose sum is σ = 1330343280. Its totient is φ = 285073536.

The previous prime is 665171603. The next prime is 665171621. The reversal of 665171612 is 216171566.

It is an interprime number because it is at equal distance from previous prime (665171603) and next prime (665171621).

665171612 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 11878037 + ... + 11878092.

It is an arithmetic number, because the mean of its divisors is an integer number (110861940).

Almost surely, 2^665171612 is an apocalyptic number.

It is an amenable number.

665171612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

665171612 is a wasteful number, since it uses less digits than its factorization.

665171612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23756140 (or 23756138 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 665171612 is about 25790.9211157725. The cubic root of 665171612 is about 872.9269506977.

The spelling of 665171612 in words is "six hundred sixty-five million, one hundred seventy-one thousand, six hundred twelve".