66365777 has 2 divisors, whose sum is σ = 66365778. Its totient is φ = 66365776.

The previous prime is 66365771. The next prime is 66365791. The reversal of 66365777 is 77756366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38950081 + 27415696 = 6241^2 + 5236^2 .

It is a cyclic number.

It is not a de Polignac number, because 66365777 - 2⁸ = 66365521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66365771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33182888 + 33182889.

It is an arithmetic number, because the mean of its divisors is an integer number (33182889).

Almost surely, 2^66365777 is an apocalyptic number.

It is an amenable number.

66365777 is a deficient number, since it is larger than the sum of its proper divisors (1).

66365777 is an equidigital number, since it uses as much as digits as its factorization.

66365777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 47.

The square root of 66365777 is about 8146.5193180892. The cubic root of 66365777 is about 404.8691890703.

The spelling of 66365777 in words is "sixty-six million, three hundred sixty-five thousand, seven hundred seventy-seven".