1666923373 has 2 divisors, whose sum is σ = 1666923374. Its totient is φ = 1666923372.

The previous prime is 1666923341. The next prime is 1666923397. The reversal of 1666923373 is 3733296661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651853449 + 15069924 = 40643^2 + 3882^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666923373 - 2⁵ = 1666923341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666923073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833461686 + 833461687.

It is an arithmetic number, because the mean of its divisors is an integer number (833461687).

Almost surely, 2^1666923373 is an apocalyptic number.

It is an amenable number.

1666923373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666923373 is an equidigital number, since it uses as much as digits as its factorization.

1666923373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 46.

The square root of 1666923373 is about 40827.9729229850. The cubic root of 1666923373 is about 1185.6919701743.

The spelling of 1666923373 in words is "one billion, six hundred sixty-six million, nine hundred twenty-three thousand, three hundred seventy-three".