666512347 has 2 divisors, whose sum is σ = 666512348. Its totient is φ = 666512346.

The previous prime is 666512333. The next prime is 666512393. The reversal of 666512347 is 743215666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666512347 - 2²⁷ = 532294619 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666512447) 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, 333256173 + 333256174.

It is an arithmetic number, because the mean of its divisors is an integer number (333256174).

Almost surely, 2^666512347 is an apocalyptic number.

666512347 is a deficient number, since it is larger than the sum of its proper divisors (1).

666512347 is an equidigital number, since it uses as much as digits as its factorization.

666512347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 666512347 is about 25816.9004142635. The cubic root of 666512347 is about 873.5130542116.

The spelling of 666512347 in words is "six hundred sixty-six million, five hundred twelve thousand, three hundred forty-seven".