66116773 has 2 divisors, whose sum is σ = 66116774. Its totient is φ = 66116772.

The previous prime is 66116767. The next prime is 66116783. The reversal of 66116773 is 37761166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 68644 = 8127^2 + 262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66116773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66116753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33058386 + 33058387.

It is an arithmetic number, because the mean of its divisors is an integer number (33058387).

Almost surely, 2^66116773 is an apocalyptic number.

It is an amenable number.

66116773 is a deficient number, since it is larger than the sum of its proper divisors (1).

66116773 is an equidigital number, since it uses as much as digits as its factorization.

66116773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 37.

The square root of 66116773 is about 8131.2221098676. Note that the first 3 decimals coincide. The cubic root of 66116773 is about 404.3621988706.

The spelling of 66116773 in words is "sixty-six million, one hundred sixteen thousand, seven hundred seventy-three".