66839167 has 2 divisors, whose sum is σ = 66839168. Its totient is φ = 66839166.

The previous prime is 66839117. The next prime is 66839177. The reversal of 66839167 is 76193866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66839167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66839107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33419583 + 33419584.

It is an arithmetic number, because the mean of its divisors is an integer number (33419584).

Almost surely, 2^66839167 is an apocalyptic number.

66839167 is a deficient number, since it is larger than the sum of its proper divisors (1).

66839167 is an equidigital number, since it uses as much as digits as its factorization.

66839167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 66839167 is about 8175.5224297900. The cubic root of 66839167 is about 405.8295591213.

The spelling of 66839167 in words is "sixty-six million, eight hundred thirty-nine thousand, one hundred sixty-seven".