668908259 has 2 divisors, whose sum is σ = 668908260. Its totient is φ = 668908258.

The previous prime is 668908213. The next prime is 668908307. The reversal of 668908259 is 952809866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668908259 - 2¹² = 668904163 is a prime.

It is a super-2 number, since 2×668908259² = 894876517916822162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668908259.

It is not a weakly prime, because it can be changed into another prime (668928259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334454129 + 334454130.

It is an arithmetic number, because the mean of its divisors is an integer number (334454130).

Almost surely, 2^668908259 is an apocalyptic number.

668908259 is a deficient number, since it is larger than the sum of its proper divisors (1).

668908259 is an equidigital number, since it uses as much as digits as its factorization.

668908259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 668908259 is about 25863.2607959631. The cubic root of 668908259 is about 874.5584750399.

The spelling of 668908259 in words is "six hundred sixty-eight million, nine hundred eight thousand, two hundred fifty-nine".