66673393181 has 2 divisors, whose sum is σ = 66673393182. Its totient is φ = 66673393180.

The previous prime is 66673393177. The next prime is 66673393201. The reversal of 66673393181 is 18139337666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56972916100 + 9700477081 = 238690^2 + 98491^2 .

It is a cyclic number.

It is not a de Polignac number, because 66673393181 - 2² = 66673393177 is a prime.

It is a super-2 number, since 2×66673393181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66673393141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336696590 + 33336696591.

It is an arithmetic number, because the mean of its divisors is an integer number (33336696591).

Almost surely, 2^66673393181 is an apocalyptic number.

It is an amenable number.

66673393181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673393181 is an equidigital number, since it uses as much as digits as its factorization.

66673393181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 53.

The spelling of 66673393181 in words is "sixty-six billion, six hundred seventy-three million, three hundred ninety-three thousand, one hundred eighty-one".