856029666 has 8 divisors (see below), whose sum is σ = 1712059344. Its totient is φ = 285343220.

The previous prime is 856029661. The next prime is 856029697. The reversal of 856029666 is 666920658.

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

856029666 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (856029661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71335800 + ... + 71335811.

It is an arithmetic number, because the mean of its divisors is an integer number (214007418).

Almost surely, 2^856029666 is an apocalyptic number.

856029666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856029666 is a wasteful number, since it uses less digits than its factorization.

856029666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142671616.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 856029666 is about 29257.9846537659. The cubic root of 856029666 is about 949.5028482797.

It can be divided in two parts, 8560 and 29666, that added together give a triangular number (38226 = T₂₇₆).

The spelling of 856029666 in words is "eight hundred fifty-six million, twenty-nine thousand, six hundred sixty-six".