666683471 has 2 divisors, whose sum is σ = 666683472. Its totient is φ = 666683470.

The previous prime is 666683467. The next prime is 666683477. The reversal of 666683471 is 174386666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666683471 - 2² = 666683467 is a prime.

It is a super-3 number, since 3×666683471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666683477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333341735 + 333341736.

It is an arithmetic number, because the mean of its divisors is an integer number (333341736).

Almost surely, 2^666683471 is an apocalyptic number.

666683471 is a deficient number, since it is larger than the sum of its proper divisors (1).

666683471 is an equidigital number, since it uses as much as digits as its factorization.

666683471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 47.

The square root of 666683471 is about 25820.2143871812. The cubic root of 666683471 is about 873.5878046433.

The spelling of 666683471 in words is "six hundred sixty-six million, six hundred eighty-three thousand, four hundred seventy-one".