66761237 has 2 divisors, whose sum is σ = 66761238. Its totient is φ = 66761236.

The previous prime is 66761221. The next prime is 66761263. The reversal of 66761237 is 73216766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43970161 + 22791076 = 6631^2 + 4774^2 .

It is a cyclic number.

It is not a de Polignac number, because 66761237 - 2⁴ = 66761221 is a prime.

It is a Chen prime.

It is equal to p_3938537 and since 66761237 and 3938537 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66761237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66761297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380618 + 33380619.

It is an arithmetic number, because the mean of its divisors is an integer number (33380619).

Almost surely, 2^66761237 is an apocalyptic number.

It is an amenable number.

66761237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66761237 is an equidigital number, since it uses as much as digits as its factorization.

66761237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 38.

The square root of 66761237 is about 8170.7549834761. The cubic root of 66761237 is about 405.6717744055.

The spelling of 66761237 in words is "sixty-six million, seven hundred sixty-one thousand, two hundred thirty-seven".