668730811 has 8 divisors (see below), whose sum is σ = 764664320. Its totient is φ = 572897448.

The previous prime is 668730793. The next prime is 668730827. The reversal of 668730811 is 118037866.

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 668730811 - 2⁵ = 668730779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668730841) 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 7 ways as a sum of consecutive naturals, for example, 10131 + ... + 37948.

It is an arithmetic number, because the mean of its divisors is an integer number (95583040).

Almost surely, 2^668730811 is an apocalyptic number.

668730811 is a deficient number, since it is larger than the sum of its proper divisors (95933509).

668730811 is a wasteful number, since it uses less digits than its factorization.

668730811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50073.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 668730811 is about 25859.8300651802. The cubic root of 668730811 is about 874.4811339023.

The spelling of 668730811 in words is "six hundred sixty-eight million, seven hundred thirty thousand, eight hundred eleven".