66703777777697 has 2 divisors, whose sum is σ = 66703777777698. Its totient is φ = 66703777777696.

The previous prime is 66703777777657. The next prime is 66703777777709. The reversal of 66703777777697 is 79677777730766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34342424578081 + 32361353199616 = 5860241^2 + 5688704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66703777777697 is a prime.

It is not a weakly prime, because it can be changed into another prime (66703777777607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33351888888848 + 33351888888849.

It is an arithmetic number, because the mean of its divisors is an integer number (33351888888849).

Almost surely, 2^{66703777777697} is an apocalyptic number.

It is an amenable number.

66703777777697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66703777777697 is an equidigital number, since it uses as much as digits as its factorization.

66703777777697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33620319432, while the sum is 86.

The spelling of 66703777777697 in words is "sixty-six trillion, seven hundred three billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred ninety-seven".