857000666 has 4 divisors (see below), whose sum is σ = 1285501002. Its totient is φ = 428500332.

The previous prime is 857000659. The next prime is 857000689. The reversal of 857000666 is 666000758.

857000666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666000758 = 2 ⋅333000379.

It can be written as a sum of positive squares in only one way, i.e., 822485041 + 34515625 = 28679^2 + 5875^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214250165 + ... + 214250168.

Almost surely, 2^857000666 is an apocalyptic number.

857000666 is a deficient number, since it is larger than the sum of its proper divisors (428500336).

857000666 is a wasteful number, since it uses less digits than its factorization.

857000666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428500335.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 857000666 is about 29274.5737116700. The cubic root of 857000666 is about 949.8617217020.

The spelling of 857000666 in words is "eight hundred fifty-seven million, six hundred sixty-six", and thus it is an aban number.