6661723 has 4 divisors (see below), whose sum is σ = 7012360. Its totient is φ = 6311088.

The previous prime is 6661709. The next prime is 6661727. The reversal of 6661723 is 3271666.

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

It is a cyclic number.

It is not a de Polignac number, because 6661723 - 2⁵ = 6661691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175290 + ... + 175327.

It is an arithmetic number, because the mean of its divisors is an integer number (1753090).

Almost surely, 2^6661723 is an apocalyptic number.

6661723 is a deficient number, since it is larger than the sum of its proper divisors (350637).

6661723 is a wasteful number, since it uses less digits than its factorization.

6661723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350636.

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

The square root of 6661723 is about 2581.0313829940. The cubic root of 6661723 is about 188.1606725876.

The spelling of 6661723 in words is "six million, six hundred sixty-one thousand, seven hundred twenty-three".