668811267 has 48 divisors (see below), whose sum is σ = 1065093120. Its totient is φ = 402796800.

The previous prime is 668811251. The next prime is 668811271. The reversal of 668811267 is 762118866.

It is a happy number.

It is not a de Polignac number, because 668811267 - 2⁴ = 668811251 is a prime.

It is a super-2 number, since 2×668811267² = 894617021732290578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668811277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 375483 + ... + 377259.

It is an arithmetic number, because the mean of its divisors is an integer number (22189440).

Almost surely, 2^668811267 is an apocalyptic number.

668811267 is a deficient number, since it is larger than the sum of its proper divisors (396281853).

668811267 is a wasteful number, since it uses less digits than its factorization.

668811267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1901 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 668811267 is about 25861.3856357311. The cubic root of 668811267 is about 874.5162025386.

It can be divided in two parts, 6688 and 11267, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 668811267 in words is "six hundred sixty-eight million, eight hundred eleven thousand, two hundred sixty-seven".