668332635309 has 28 divisors (see below), whose sum is σ = 1002120704992. Its totient is φ = 445519456200.

The previous prime is 668332635287. The next prime is 668332635331. The reversal of 668332635309 is 903536233866.

668332635309 is a `hidden beast` number, since 6 + 6 + 8 + 3 + 326 + 3 + 5 + 309 = 666.

It is an interprime number because it is at equal distance from previous prime (668332635287) and next prime (668332635331).

It is not a de Polignac number, because 668332635309 - 2⁹ = 668332634797 is a prime.

It is a super-2 number, since 2×668332635309² (a number of 24 digits) 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 (668332635349) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11628774 + ... + 11686104.

Almost surely, 2^668332635309 is an apocalyptic number.

It is an amenable number.

668332635309 is a deficient number, since it is larger than the sum of its proper divisors (333788069683).

668332635309 is an equidigital number, since it uses as much as digits as its factorization.

668332635309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73340 (or 73325 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 54.

The spelling of 668332635309 in words is "six hundred sixty-eight billion, three hundred thirty-two million, six hundred thirty-five thousand, three hundred nine".