66377761 has 2 divisors, whose sum is σ = 66377762. Its totient is φ = 66377760.

The previous prime is 66377749. The next prime is 66377777. The reversal of 66377761 is 16777366.

66377761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43758225 + 22619536 = 6615^2 + 4756^2 .

It is a cyclic number.

It is not a de Polignac number, because 66377761 - 2¹¹ = 66375713 is a prime.

It is not a weakly prime, because it can be changed into another prime (66377461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33188880 + 33188881.

It is an arithmetic number, because the mean of its divisors is an integer number (33188881).

Almost surely, 2^66377761 is an apocalyptic number.

It is an amenable number.

66377761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66377761 is an equidigital number, since it uses as much as digits as its factorization.

66377761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 43.

The square root of 66377761 is about 8147.2548137394. The cubic root of 66377761 is about 404.8935573545.

The spelling of 66377761 in words is "sixty-six million, three hundred seventy-seven thousand, seven hundred sixty-one".