66543167 has 2 divisors, whose sum is σ = 66543168. Its totient is φ = 66543166.

The previous prime is 66543161. The next prime is 66543173. The reversal of 66543167 is 76134566.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (66543161) and next prime (66543173).

It is a cyclic number.

It is not a de Polignac number, because 66543167 - 2⁸ = 66542911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66543167.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66543161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271583 + 33271584.

It is an arithmetic number, because the mean of its divisors is an integer number (33271584).

Almost surely, 2^66543167 is an apocalyptic number.

66543167 is a deficient number, since it is larger than the sum of its proper divisors (1).

66543167 is an equidigital number, since it uses as much as digits as its factorization.

66543167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 66543167 is about 8157.3995243582. The cubic root of 66543167 is about 405.2295949613.

The spelling of 66543167 in words is "sixty-six million, five hundred forty-three thousand, one hundred sixty-seven".