856166 has 4 divisors (see below), whose sum is σ = 1284252. Its totient is φ = 428082.

The previous prime is 856153. The next prime is 856169. The reversal of 856166 is 661658.

Added to its reverse (661658) it gives a square (1517824 = 1232²).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214040 + ... + 214043.

It is an arithmetic number, because the mean of its divisors is an integer number (321063).

2⁸⁵⁶¹⁶⁶ is an apocalyptic number.

856166 is a deficient number, since it is larger than the sum of its proper divisors (428086).

856166 is a wasteful number, since it uses less digits than its factorization.

856166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428085.

The product of its digits is 8640, while the sum is 32.

The square root of 856166 is about 925.2923862218. The cubic root of 856166 is about 94.9553252549.

Adding to 856166 its reverse (661658), we get a square (1517824 = 1232²).

The spelling of 856166 in words is "eight hundred fifty-six thousand, one hundred sixty-six".