818272666 has 8 divisors (see below), whose sum is σ = 1247530644. Its totient is φ = 402429120.

The previous prime is 818272643. The next prime is 818272699. The reversal of 818272666 is 666272818.

818272666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 815959225 + 2313441 = 28565^2 + 1521^2 .

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

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, 3353455 + ... + 3353698.

Almost surely, 2^818272666 is an apocalyptic number.

818272666 is a deficient number, since it is larger than the sum of its proper divisors (429257978).

818272666 is a wasteful number, since it uses less digits than its factorization.

818272666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707216.

The product of its digits is 387072, while the sum is 46.

The square root of 818272666 is about 28605.4656665470. The cubic root of 818272666 is about 935.3324776782.

The spelling of 818272666 in words is "eight hundred eighteen million, two hundred seventy-two thousand, six hundred sixty-six".