6722666 has 4 divisors (see below), whose sum is σ = 10084002. Its totient is φ = 3361332.

The previous prime is 6722659. The next prime is 6722669. The reversal of 6722666 is 6662276.

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

It can be written as a sum of positive squares in only one way, i.e., 3500641 + 3222025 = 1871^2 + 1795^2 .

It is not an unprimeable number, because it can be changed into a prime (6722669) by changing a digit.

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, 1680665 + ... + 1680668.

Almost surely, 2^6722666 is an apocalyptic number.

6722666 is a deficient number, since it is larger than the sum of its proper divisors (3361336).

6722666 is a wasteful number, since it uses less digits than its factorization.

6722666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361335.

The product of its digits is 36288, while the sum is 35.

The square root of 6722666 is about 2592.8104442863. The cubic root of 6722666 is about 188.7327110167.

The spelling of 6722666 in words is "six million, seven hundred twenty-two thousand, six hundred sixty-six".