66769237 has 2 divisors, whose sum is σ = 66769238. Its totient is φ = 66769236.

The previous prime is 66769193. The next prime is 66769273. The reversal of 66769237 is 73296766.

Together with next prime (66769273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34210801 + 32558436 = 5849^2 + 5706^2 .

It is a cyclic number.

It is not a de Polignac number, because 66769237 - 2¹¹ = 66767189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66769037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33384618 + 33384619.

It is an arithmetic number, because the mean of its divisors is an integer number (33384619).

Almost surely, 2^66769237 is an apocalyptic number.

It is an amenable number.

66769237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66769237 is an equidigital number, since it uses as much as digits as its factorization.

66769237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 46.

The square root of 66769237 is about 8171.2445196555. The cubic root of 66769237 is about 405.6879776432.

The spelling of 66769237 in words is "sixty-six million, seven hundred sixty-nine thousand, two hundred thirty-seven".