668495269 has 16 divisors (see below), whose sum is σ = 748606320. Its totient is φ = 592704000.

The previous prime is 668495257. The next prime is 668495273. The reversal of 668495269 is 962594866.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 893025 + 667602244 = 945^2 + 25838^2 .

It is a cyclic number.

It is not a de Polignac number, because 668495269 - 2⁷ = 668495141 is a prime.

It is a super-2 number, since 2×668495269² = 893771849350764722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668495249) 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 in 15 ways as a sum of consecutive naturals, for example, 69769 + ... + 78769.

It is an arithmetic number, because the mean of its divisors is an integer number (46787895).

Almost surely, 2^668495269 is an apocalyptic number.

It is an amenable number.

668495269 is a deficient number, since it is larger than the sum of its proper divisors (80111051).

668495269 is a wasteful number, since it uses less digits than its factorization.

668495269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240.

The product of its digits is 5598720, while the sum is 55.

The square root of 668495269 is about 25855.2754578248. The cubic root of 668495269 is about 874.3784512185.

The spelling of 668495269 in words is "six hundred sixty-eight million, four hundred ninety-five thousand, two hundred sixty-nine".