666514997 has 2 divisors, whose sum is σ = 666514998. Its totient is φ = 666514996.

The previous prime is 666514951. The next prime is 666515023. The reversal of 666514997 is 799415666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657358321 + 9156676 = 25639^2 + 3026^2 .

It is a cyclic number.

It is not a de Polignac number, because 666514997 - 2⁸ = 666514741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666514397) 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, 333257498 + 333257499.

It is an arithmetic number, because the mean of its divisors is an integer number (333257499).

Almost surely, 2^666514997 is an apocalyptic number.

It is an amenable number.

666514997 is a deficient number, since it is larger than the sum of its proper divisors (1).

666514997 is an equidigital number, since it uses as much as digits as its factorization.

666514997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 53.

The square root of 666514997 is about 25816.9517371823. The cubic root of 666514997 is about 873.5142118828.

The spelling of 666514997 in words is "six hundred sixty-six million, five hundred fourteen thousand, nine hundred ninety-seven".