16659723 has 4 divisors (see below), whose sum is σ = 22212968. Its totient is φ = 11106480.

The previous prime is 16659719. The next prime is 16659739. The reversal of 16659723 is 32795661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32795661 = 3 ⋅10931887.

It is not a de Polignac number, because 16659723 - 2² = 16659719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16659743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776618 + ... + 2776623.

It is an arithmetic number, because the mean of its divisors is an integer number (5553242).

Almost surely, 2^16659723 is an apocalyptic number.

16659723 is a deficient number, since it is larger than the sum of its proper divisors (5553245).

16659723 is an equidigital number, since it uses as much as digits as its factorization.

16659723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553244.

The product of its digits is 68040, while the sum is 39.

The square root of 16659723 is about 4081.6323940306. The cubic root of 16659723 is about 255.4009992220.

The spelling of 16659723 in words is "sixteen million, six hundred fifty-nine thousand, seven hundred twenty-three".