66668143 has 2 divisors, whose sum is σ = 66668144. Its totient is φ = 66668142.

The previous prime is 66668051. The next prime is 66668159. The reversal of 66668143 is 34186666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66668143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66668096 and 66668105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66668243) 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 as a sum of consecutive naturals, namely, 33334071 + 33334072.

It is an arithmetic number, because the mean of its divisors is an integer number (33334072).

Almost surely, 2^66668143 is an apocalyptic number.

66668143 is a deficient number, since it is larger than the sum of its proper divisors (1).

66668143 is an equidigital number, since it uses as much as digits as its factorization.

66668143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 66668143 is about 8165.0562153607. The cubic root of 66668143 is about 405.4831261353.

The spelling of 66668143 in words is "sixty-six million, six hundred sixty-eight thousand, one hundred forty-three".