666818485 has 4 divisors (see below), whose sum is σ = 800182188. Its totient is φ = 533454784.

The previous prime is 666818479. The next prime is 666818513. The reversal of 666818485 is 584818666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138462289 + 528356196 = 11767^2 + 22986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666818485 is a prime.

It is a Duffinian number.

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, 66681844 + ... + 66681853.

It is an arithmetic number, because the mean of its divisors is an integer number (200045547).

Almost surely, 2^666818485 is an apocalyptic number.

It is an amenable number.

666818485 is a deficient number, since it is larger than the sum of its proper divisors (133363703).

666818485 is a wasteful number, since it uses less digits than its factorization.

666818485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133363702.

The product of its digits is 2211840, while the sum is 52.

The square root of 666818485 is about 25822.8287567416. The cubic root of 666818485 is about 873.6467724683.

The spelling of 666818485 in words is "six hundred sixty-six million, eight hundred eighteen thousand, four hundred eighty-five".