668548707773 has 2 divisors, whose sum is σ = 668548707774. Its totient is φ = 668548707772.

The previous prime is 668548707751. The next prime is 668548707787. The reversal of 668548707773 is 377707845866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541868237689 + 126680470084 = 736117^2 + 355922^2 .

It is a cyclic number.

It is not a de Polignac number, because 668548707773 - 2²⁶ = 668481598909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668548707713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334274353886 + 334274353887.

It is an arithmetic number, because the mean of its divisors is an integer number (334274353887).

Almost surely, 2^668548707773 is an apocalyptic number.

It is an amenable number.

668548707773 is a deficient number, since it is larger than the sum of its proper divisors (1).

668548707773 is an equidigital number, since it uses as much as digits as its factorization.

668548707773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331914240, while the sum is 68.

The spelling of 668548707773 in words is "six hundred sixty-eight billion, five hundred forty-eight million, seven hundred seven thousand, seven hundred seventy-three".