66169237 has 2 divisors, whose sum is σ = 66169238. Its totient is φ = 66169236.

The previous prime is 66169223. The next prime is 66169249. The reversal of 66169237 is 73296166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65141041 + 1028196 = 8071^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 66169237 - 2⁷ = 66169109 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 66169237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66169277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33084618 + 33084619.

It is an arithmetic number, because the mean of its divisors is an integer number (33084619).

Almost surely, 2^66169237 is an apocalyptic number.

It is an amenable number.

66169237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66169237 is an equidigital number, since it uses as much as digits as its factorization.

66169237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 66169237 is about 8134.4475534605. The cubic root of 66169237 is about 404.4691250894.

The spelling of 66169237 in words is "sixty-six million, one hundred sixty-nine thousand, two hundred thirty-seven".