66673393777 has 2 divisors, whose sum is σ = 66673393778. Its totient is φ = 66673393776.

The previous prime is 66673393751. The next prime is 66673393781. The reversal of 66673393777 is 77739337666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64027217296 + 2646176481 = 253036^2 + 51441^2 .

It is a cyclic number.

It is not a de Polignac number, because 66673393777 - 2¹⁹ = 66672869489 is a prime.

It is not a weakly prime, because it can be changed into another prime (66673393177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336696888 + 33336696889.

It is an arithmetic number, because the mean of its divisors is an integer number (33336696889).

Almost surely, 2^66673393777 is an apocalyptic number.

It is an amenable number.

66673393777 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673393777 is an equidigital number, since it uses as much as digits as its factorization.

66673393777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126023688, while the sum is 64.

The spelling of 66673393777 in words is "sixty-six billion, six hundred seventy-three million, three hundred ninety-three thousand, seven hundred seventy-seven".