16668293 has 4 divisors (see below), whose sum is σ = 16687020. Its totient is φ = 16649568.

The previous prime is 16668287. The next prime is 16668299. The reversal of 16668293 is 39286661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39286661 = 19 ⋅2067719.

It is an interprime number because it is at equal distance from previous prime (16668287) and next prime (16668299).

It can be written as a sum of positive squares in 2 ways, for example, as 9012004 + 7656289 = 3002^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 16668293 - 2⁴ = 16668277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16668293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668299) 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, 7958 + ... + 9831.

It is an arithmetic number, because the mean of its divisors is an integer number (4171755).

Almost surely, 2^16668293 is an apocalyptic number.

It is an amenable number.

16668293 is a deficient number, since it is larger than the sum of its proper divisors (18727).

16668293 is an equidigital number, since it uses as much as digits as its factorization.

16668293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18726.

The product of its digits is 93312, while the sum is 41.

The square root of 16668293 is about 4082.6820841207. The cubic root of 16668293 is about 255.4447856914. Note that the first 3 decimals are identical.

It can be divided in two parts, 16668 and 293, that added together give a palindrome (16961).

The spelling of 16668293 in words is "sixteen million, six hundred sixty-eight thousand, two hundred ninety-three".