666352447 has 2 divisors, whose sum is σ = 666352448. Its totient is φ = 666352446.

The previous prime is 666352433. The next prime is 666352483. The reversal of 666352447 is 744253666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666352447 - 2¹⁵ = 666319679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666352747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333176223 + 333176224.

It is an arithmetic number, because the mean of its divisors is an integer number (333176224).

Almost surely, 2^666352447 is an apocalyptic number.

666352447 is a deficient number, since it is larger than the sum of its proper divisors (1).

666352447 is an equidigital number, since it uses as much as digits as its factorization.

666352447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 43.

The square root of 666352447 is about 25813.8034198760. The cubic root of 666352447 is about 873.4431950864.

The spelling of 666352447 in words is "six hundred sixty-six million, three hundred fifty-two thousand, four hundred forty-seven".