668203811 has 8 divisors (see below), whose sum is σ = 730404864. Its totient is φ = 606245320.

The previous prime is 668203741. The next prime is 668203813. The reversal of 668203811 is 118302866.

668203811 = 259² + 260² + ... + 1264².

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 668203811 - 2¹⁴ = 668187427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668203813) 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, 54851 + ... + 65916.

It is an arithmetic number, because the mean of its divisors is an integer number (91300608).

Almost surely, 2^668203811 is an apocalyptic number.

668203811 is a deficient number, since it is larger than the sum of its proper divisors (62201053).

668203811 is a wasteful number, since it uses less digits than its factorization.

668203811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121281.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 668203811 is about 25849.6385081107. The cubic root of 668203811 is about 874.2513590001.

The spelling of 668203811 in words is "six hundred sixty-eight million, two hundred three thousand, eight hundred eleven".