665670773 has 2 divisors, whose sum is σ = 665670774. Its totient is φ = 665670772.

The previous prime is 665670767. The next prime is 665670779. The reversal of 665670773 is 377076566.

It is a balanced prime because it is at equal distance from previous prime (665670767) and next prime (665670779).

It can be written as a sum of positive squares in only one way, i.e., 660644209 + 5026564 = 25703^2 + 2242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665670773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665670779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332835386 + 332835387.

It is an arithmetic number, because the mean of its divisors is an integer number (332835387).

Almost surely, 2^665670773 is an apocalyptic number.

It is an amenable number.

665670773 is a deficient number, since it is larger than the sum of its proper divisors (1).

665670773 is an equidigital number, since it uses as much as digits as its factorization.

665670773 is an odious number, because the sum of its binary digits is odd.

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

The square root of 665670773 is about 25800.5963690764. The cubic root of 665670773 is about 873.1452513251.

The spelling of 665670773 in words is "six hundred sixty-five million, six hundred seventy thousand, seven hundred seventy-three".