66812167 has 2 divisors, whose sum is σ = 66812168. Its totient is φ = 66812166.

The previous prime is 66812149. The next prime is 66812177. The reversal of 66812167 is 76121866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66812167 - 2¹⁵ = 66779399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66812107) 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, 33406083 + 33406084.

It is an arithmetic number, because the mean of its divisors is an integer number (33406084).

Almost surely, 2^66812167 is an apocalyptic number.

66812167 is a deficient number, since it is larger than the sum of its proper divisors (1).

66812167 is an equidigital number, since it uses as much as digits as its factorization.

66812167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 66812167 is about 8173.8709923756. The cubic root of 66812167 is about 405.7749061668.

The spelling of 66812167 in words is "sixty-six million, eight hundred twelve thousand, one hundred sixty-seven".