66617143 has 2 divisors, whose sum is σ = 66617144. Its totient is φ = 66617142.

The previous prime is 66617113. The next prime is 66617153. The reversal of 66617143 is 34171666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66617143 - 2⁹ = 66616631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66617099 and 66617108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66617113) 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, 33308571 + 33308572.

It is an arithmetic number, because the mean of its divisors is an integer number (33308572).

Almost surely, 2^66617143 is an apocalyptic number.

66617143 is a deficient number, since it is larger than the sum of its proper divisors (1).

66617143 is an equidigital number, since it uses as much as digits as its factorization.

66617143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 66617143 is about 8161.9325530171. The cubic root of 66617143 is about 405.3797038513.

The spelling of 66617143 in words is "sixty-six million, six hundred seventeen thousand, one hundred forty-three".