666450038393 has 2 divisors, whose sum is σ = 666450038394. Its totient is φ = 666450038392.

The previous prime is 666450038383. The next prime is 666450038483. The reversal of 666450038393 is 393830054666.

666450038393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665926177849 + 523860544 = 816043^2 + 22888^2 .

It is a cyclic number.

It is not a de Polignac number, because 666450038393 - 2¹⁰ = 666450037369 is a prime.

It is not a weakly prime, because it can be changed into another prime (666450038383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333225019196 + 333225019197.

It is an arithmetic number, because the mean of its divisors is an integer number (333225019197).

Almost surely, 2^666450038393 is an apocalyptic number.

It is an amenable number.

666450038393 is a deficient number, since it is larger than the sum of its proper divisors (1).

666450038393 is an equidigital number, since it uses as much as digits as its factorization.

666450038393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 53.

The spelling of 666450038393 in words is "six hundred sixty-six billion, four hundred fifty million, thirty-eight thousand, three hundred ninety-three".