668499269 has 2 divisors, whose sum is σ = 668499270. Its totient is φ = 668499268.

The previous prime is 668499257. The next prime is 668499331. The reversal of 668499269 is 962994866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452115169 + 216384100 = 21263^2 + 14710^2 .

It is a cyclic number.

It is not a de Polignac number, because 668499269 - 2⁴ = 668499253 is a prime.

It is a super-2 number, since 2×668499269² = 893782545307068722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668499869) 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, 334249634 + 334249635.

It is an arithmetic number, because the mean of its divisors is an integer number (334249635).

Almost surely, 2^668499269 is an apocalyptic number.

It is an amenable number.

668499269 is a deficient number, since it is larger than the sum of its proper divisors (1).

668499269 is an equidigital number, since it uses as much as digits as its factorization.

668499269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10077696, while the sum is 59.

The square root of 668499269 is about 25855.3528113619. The cubic root of 668499269 is about 874.3801951884.

The spelling of 668499269 in words is "six hundred sixty-eight million, four hundred ninety-nine thousand, two hundred sixty-nine".