6720166 has 4 divisors (see below), whose sum is σ = 10080252. Its totient is φ = 3360082.

The previous prime is 6720157. The next prime is 6720173. The reversal of 6720166 is 6610276.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680040 + ... + 1680043.

It is an arithmetic number, because the mean of its divisors is an integer number (2520063).

Almost surely, 2^6720166 is an apocalyptic number.

6720166 is a deficient number, since it is larger than the sum of its proper divisors (3360086).

6720166 is a wasteful number, since it uses less digits than its factorization.

6720166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360085.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 6720166 is about 2592.3282971105. The cubic root of 6720166 is about 188.7093130435.

It can be divided in two parts, 6720 and 166, that added together give a palindrome (6886).

The spelling of 6720166 in words is "six million, seven hundred twenty thousand, one hundred sixty-six".