666874368 has 120 divisors (see below), whose sum is σ = 2038098348. Its totient is φ = 209190912.

The previous prime is 666874367. The next prime is 666874423. The reversal of 666874368 is 863478666.

666874368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 533055744 + 133818624 = 23088^2 + 11568^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666874367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74080 + ... + 82592.

Almost surely, 2^666874368 is an apocalyptic number.

666874368 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666874368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019049174).

666874368 is an abundant number, since it is smaller than the sum of its proper divisors (1371223980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666874368 is a wasteful number, since it uses less digits than its factorization.

666874368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8554 (or 8535 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 666874368 is about 25823.9107805150. The cubic root of 666874368 is about 873.6711772300.

The spelling of 666874368 in words is "six hundred sixty-six million, eight hundred seventy-four thousand, three hundred sixty-eight".