66750637 has 2 divisors, whose sum is σ = 66750638. Its totient is φ = 66750636.

The previous prime is 66750613. The next prime is 66750661. The reversal of 66750637 is 73605766.

It is a balanced prime because it is at equal distance from previous prime (66750613) and next prime (66750661).

It can be written as a sum of positive squares in only one way, i.e., 66683556 + 67081 = 8166^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 66750637 - 2¹¹ = 66748589 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 66750637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66750137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33375318 + 33375319.

It is an arithmetic number, because the mean of its divisors is an integer number (33375319).

Almost surely, 2^66750637 is an apocalyptic number.

It is an amenable number.

66750637 is a deficient number, since it is larger than the sum of its proper divisors (1).

66750637 is an equidigital number, since it uses as much as digits as its factorization.

66750637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 66750637 is about 8170.1063028580. The cubic root of 66750637 is about 405.6503031217.

The spelling of 66750637 in words is "sixty-six million, seven hundred fifty thousand, six hundred thirty-seven".