668808507 has 8 divisors (see below), whose sum is σ = 892760400. Its totient is φ = 445364480.

The previous prime is 668808473. The next prime is 668808521. The reversal of 668808507 is 705808866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668808507 - 2¹¹ = 668806459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668807507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123882 + ... + 129167.

It is an arithmetic number, because the mean of its divisors is an integer number (111595050).

Almost surely, 2^668808507 is an apocalyptic number.

668808507 is a deficient number, since it is larger than the sum of its proper divisors (223951893).

668808507 is a wasteful number, since it uses less digits than its factorization.

668808507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253933.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 668808507 is about 25861.3322742662. The cubic root of 668808507 is about 874.5149995744.

The spelling of 668808507 in words is "six hundred sixty-eight million, eight hundred eight thousand, five hundred seven".