857438666 has 64 divisors (see below), whose sum is σ = 1596948480. Its totient is φ = 337296960.

The previous prime is 857438657. The next prime is 857438677. The reversal of 857438666 is 666834758.

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 31 ways as a sum of consecutive naturals, for example, 940751 + ... + 941661.

It is an arithmetic number, because the mean of its divisors is an integer number (24952320).

Almost surely, 2^857438666 is an apocalyptic number.

857438666 is a deficient number, since it is larger than the sum of its proper divisors (739509814).

857438666 is a wasteful number, since it uses less digits than its factorization.

857438666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059.

The product of its digits is 5806080, while the sum is 53.

The square root of 857438666 is about 29282.0536506578. The cubic root of 857438666 is about 950.0235140994.

The spelling of 857438666 in words is "eight hundred fifty-seven million, four hundred thirty-eight thousand, six hundred sixty-six".