668811331 has 8 divisors (see below), whose sum is σ = 712500624. Its totient is φ = 625605120.

The previous prime is 668811307. The next prime is 668811349. The reversal of 668811331 is 133118866.

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 668811331 - 2¹³ = 668803139 is a prime.

It is a super-2 number, since 2×668811331² = 894617192947983122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668811931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117910 + ... + 123451.

It is an arithmetic number, because the mean of its divisors is an integer number (89062578).

Almost surely, 2^668811331 is an apocalyptic number.

668811331 is a deficient number, since it is larger than the sum of its proper divisors (43689293).

668811331 is a wasteful number, since it uses less digits than its factorization.

668811331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241541.

The product of its digits is 20736, while the sum is 37.

The square root of 668811331 is about 25861.3868730971. The cubic root of 668811331 is about 874.5162304334.

The spelling of 668811331 in words is "six hundred sixty-eight million, eight hundred eleven thousand, three hundred thirty-one".