66843377 has 2 divisors, whose sum is σ = 66843378. Its totient is φ = 66843376.

The previous prime is 66843367. The next prime is 66843383. The reversal of 66843377 is 77334866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 1168561 = 8104^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 66843377 - 2¹² = 66839281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66843307) 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, 33421688 + 33421689.

It is an arithmetic number, because the mean of its divisors is an integer number (33421689).

Almost surely, 2^66843377 is an apocalyptic number.

It is an amenable number.

66843377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66843377 is an equidigital number, since it uses as much as digits as its factorization.

66843377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 44.

The square root of 66843377 is about 8175.7799016363. The cubic root of 66843377 is about 405.8380796073.

The spelling of 66843377 in words is "sixty-six million, eight hundred forty-three thousand, three hundred seventy-seven".