66731193 has 12 divisors (see below), whose sum is σ = 97094868. Its totient is φ = 44161920.

The previous prime is 66731177. The next prime is 66731207. The reversal of 66731193 is 39113766.

It can be written as a sum of positive squares in 2 ways, for example, as 12089529 + 54641664 = 3477^2 + 7392^2 .

It is not a de Polignac number, because 66731193 - 2⁴ = 66731177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66731113) 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 11 ways as a sum of consecutive naturals, for example, 25828 + ... + 28293.

It is an arithmetic number, because the mean of its divisors is an integer number (8091239).

Almost surely, 2^66731193 is an apocalyptic number.

It is an amenable number.

66731193 is a deficient number, since it is larger than the sum of its proper divisors (30363675).

66731193 is a wasteful number, since it uses less digits than its factorization.

66731193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54264 (or 54261 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 66731193 is about 8168.9162683920. The cubic root of 66731193 is about 405.6109115851.

The spelling of 66731193 in words is "sixty-six million, seven hundred thirty-one thousand, one hundred ninety-three".