266664985 has 8 divisors (see below), whose sum is σ = 324381960. Its totient is φ = 210409344.

The previous prime is 266664953. The next prime is 266664991. The reversal of 266664985 is 589466662.

It can be written as a sum of positive squares in 4 ways, for example, as 18696976 + 247968009 = 4324^2 + 15747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266664985 - 2⁵ = 266664953 is a prime.

It is a super-2 number, since 2×266664985² = 142220428450100450, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 364930 + ... + 365659.

It is an arithmetic number, because the mean of its divisors is an integer number (40547745).

Almost surely, 2^266664985 is an apocalyptic number.

It is an amenable number.

266664985 is a deficient number, since it is larger than the sum of its proper divisors (57716975).

266664985 is an equidigital number, since it uses as much as digits as its factorization.

266664985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730667.

The product of its digits is 3732480, while the sum is 52.

The square root of 266664985 is about 16329.8801281577. The cubic root of 266664985 is about 643.6582367081.

The spelling of 266664985 in words is "two hundred sixty-six million, six hundred sixty-four thousand, nine hundred eighty-five".