66923193 has 16 divisors (see below), whose sum is σ = 91728000. Its totient is φ = 43374720.

The previous prime is 66923183. The next prime is 66923209. The reversal of 66923193 is 39132966.

It is not a de Polignac number, because 66923193 - 2⁴ = 66923177 is a prime.

It is a super-2 number, since 2×66923193² = 8957427522630498, which contains 22 as substring.

It is a house number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66923173) 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 15 ways as a sum of consecutive naturals, for example, 42148 + ... + 43706.

It is an arithmetic number, because the mean of its divisors is an integer number (5733000).

Almost surely, 2^66923193 is an apocalyptic number.

It is an amenable number.

66923193 is a deficient number, since it is larger than the sum of its proper divisors (24804807).

66923193 is a wasteful number, since it uses less digits than its factorization.

66923193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952.

The product of its digits is 52488, while the sum is 39.

The square root of 66923193 is about 8180.6596922253. The cubic root of 66923193 is about 405.9995490462. Note that the first 3 decimals are identical.

The spelling of 66923193 in words is "sixty-six million, nine hundred twenty-three thousand, one hundred ninety-three".