809666612 has 12 divisors (see below), whose sum is σ = 1422999396. Its totient is φ = 403095360.

The previous prime is 809666609. The next prime is 809666621. The reversal of 809666612 is 216666908.

It can be written as a sum of positive squares in 2 ways, for example, as 320195236 + 489471376 = 17894^2 + 22124^2 .

It is a super-3 number, since 3×809666612³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433439 + ... + 435302.

It is an arithmetic number, because the mean of its divisors is an integer number (118583283).

Almost surely, 2^809666612 is an apocalyptic number.

It is an amenable number.

809666612 is a deficient number, since it is larger than the sum of its proper divisors (613332784).

809666612 is a wasteful number, since it uses less digits than its factorization.

809666612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868978 (or 868976 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 809666612 is about 28454.6413085809. The cubic root of 809666612 is about 932.0418436149.

It can be divided in two parts, 80966 and 6612, that added together give a palindrome (87578).

The spelling of 809666612 in words is "eight hundred nine million, six hundred sixty-six thousand, six hundred twelve".