666512393 has 2 divisors, whose sum is σ = 666512394. Its totient is φ = 666512392.

The previous prime is 666512347. The next prime is 666512401. The reversal of 666512393 is 393215666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478603129 + 187909264 = 21877^2 + 13708^2 .

It is a cyclic number.

It is not a de Polignac number, because 666512393 - 2¹⁰ = 666511369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666512393.

It is not a weakly prime, because it can be changed into another prime (666512333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333256196 + 333256197.

It is an arithmetic number, because the mean of its divisors is an integer number (333256197).

Almost surely, 2^666512393 is an apocalyptic number.

It is an amenable number.

666512393 is a deficient number, since it is larger than the sum of its proper divisors (1).

666512393 is an equidigital number, since it uses as much as digits as its factorization.

666512393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 41.

The square root of 666512393 is about 25816.9013051528. The cubic root of 666512393 is about 873.5130743070.

The spelling of 666512393 in words is "six hundred sixty-six million, five hundred twelve thousand, three hundred ninety-three".