666783373 has 2 divisors, whose sum is σ = 666783374. Its totient is φ = 666783372.

The previous prime is 666783331. The next prime is 666783419. The reversal of 666783373 is 373387666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616131684 + 50651689 = 24822^2 + 7117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666783373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666783773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333391686 + 333391687.

It is an arithmetic number, because the mean of its divisors is an integer number (333391687).

Almost surely, 2^666783373 is an apocalyptic number.

It is an amenable number.

666783373 is a deficient number, since it is larger than the sum of its proper divisors (1).

666783373 is an equidigital number, since it uses as much as digits as its factorization.

666783373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 49.

The square root of 666783373 is about 25822.1488842428. The cubic root of 666783373 is about 873.6314379484.

The spelling of 666783373 in words is "six hundred sixty-six million, seven hundred eighty-three thousand, three hundred seventy-three".