6723661 has 4 divisors (see below), whose sum is σ = 7684192. Its totient is φ = 5763132.

The previous prime is 6723643. The next prime is 6723667. The reversal of 6723661 is 1663276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6723661 - 2⁷ = 6723533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6723667) 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 in 3 ways as a sum of consecutive naturals, for example, 480255 + ... + 480268.

It is an arithmetic number, because the mean of its divisors is an integer number (1921048).

Almost surely, 2^6723661 is an apocalyptic number.

It is an amenable number.

6723661 is a deficient number, since it is larger than the sum of its proper divisors (960531).

6723661 is an equidigital number, since it uses as much as digits as its factorization.

6723661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960530.

The product of its digits is 9072, while the sum is 31.

The square root of 6723661 is about 2593.0023139211. The cubic root of 6723661 is about 188.7420217963.

The spelling of 6723661 in words is "six million, seven hundred twenty-three thousand, six hundred sixty-one".