66666193 has 24 divisors (see below), whose sum is σ = 79017120. Its totient is φ = 55624320.

The previous prime is 66666191. The next prime is 66666199. The reversal of 66666193 is 39166666.

It is not a de Polignac number, because 66666193 - 2¹ = 66666191 is a prime.

It is a super-2 number, since 2×66666193² = 8888762578226498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66666191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286005 + ... + 286237.

It is an arithmetic number, because the mean of its divisors is an integer number (3292380).

Almost surely, 2^66666193 is an apocalyptic number.

It is an amenable number.

66666193 is a deficient number, since it is larger than the sum of its proper divisors (12350927).

66666193 is a wasteful number, since it uses less digits than its factorization.

66666193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 300 counting only the distinct ones).

The product of its digits is 209952, while the sum is 43.

The square root of 66666193 is about 8164.9368031847. The cubic root of 66666193 is about 405.4791727238.

The spelling of 66666193 in words is "sixty-six million, six hundred sixty-six thousand, one hundred ninety-three".