66875129 has 2 divisors, whose sum is σ = 66875130. Its totient is φ = 66875128.

The previous prime is 66875111. The next prime is 66875167. The reversal of 66875129 is 92157866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61653904 + 5221225 = 7852^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 66875129 - 2¹² = 66871033 is a prime.

It is a super-3 number, since 3×66875129³ (a number of 24 digits) contains 333 as substring.

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 66875129.

It is not a weakly prime, because it can be changed into another prime (66875629) 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, 33437564 + 33437565.

It is an arithmetic number, because the mean of its divisors is an integer number (33437565).

Almost surely, 2^66875129 is an apocalyptic number.

It is an amenable number.

66875129 is a deficient number, since it is larger than the sum of its proper divisors (1).

66875129 is an equidigital number, since it uses as much as digits as its factorization.

66875129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 66875129 is about 8177.7215041844. The cubic root of 66875129 is about 405.9023299560.

The spelling of 66875129 in words is "sixty-six million, eight hundred seventy-five thousand, one hundred twenty-nine".