6659723 has 4 divisors (see below), whose sum is σ = 7611120. Its totient is φ = 5708328.

The previous prime is 6659713. The next prime is 6659749. The reversal of 6659723 is 3279566.

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 6659723 - 2¹⁸ = 6397579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6659713) 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, 475688 + ... + 475701.

It is an arithmetic number, because the mean of its divisors is an integer number (1902780).

Almost surely, 2^6659723 is an apocalyptic number.

6659723 is a deficient number, since it is larger than the sum of its proper divisors (951397).

6659723 is an equidigital number, since it uses as much as digits as its factorization.

6659723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951396.

The product of its digits is 68040, while the sum is 38.

The square root of 6659723 is about 2580.6439118949. The cubic root of 6659723 is about 188.1418406722.

The spelling of 6659723 in words is "six million, six hundred fifty-nine thousand, seven hundred twenty-three".