66138167 has 2 divisors, whose sum is σ = 66138168. Its totient is φ = 66138166.

The previous prime is 66138157. The next prime is 66138181. The reversal of 66138167 is 76183166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66138167 - 2¹⁰ = 66137143 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66138167.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66138157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33069083 + 33069084.

It is an arithmetic number, because the mean of its divisors is an integer number (33069084).

Almost surely, 2^66138167 is an apocalyptic number.

66138167 is a deficient number, since it is larger than the sum of its proper divisors (1).

66138167 is an equidigital number, since it uses as much as digits as its factorization.

66138167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 66138167 is about 8132.5375498672. The cubic root of 66138167 is about 404.4058085407.

The spelling of 66138167 in words is "sixty-six million, one hundred thirty-eight thousand, one hundred sixty-seven".