666266667 has 8 divisors (see below), whose sum is σ = 969115200. Its totient is φ = 403797960.

The previous prime is 666266651. The next prime is 666266681. The reversal of 666266667 is 766662666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666266667 - 2⁴ = 666266651 is a prime.

It is a super-2 number, since 2×666266667² = 887822543110577778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666266267) 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, 10094917 + ... + 10094982.

It is an arithmetic number, because the mean of its divisors is an integer number (121139400).

Almost surely, 2^666266667 is an apocalyptic number.

666266667 is a deficient number, since it is larger than the sum of its proper divisors (302848533).

666266667 is a wasteful number, since it uses less digits than its factorization.

666266667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20189913.

The product of its digits is 3919104, while the sum is 51.

The square root of 666266667 is about 25812.1418522369. The cubic root of 666266667 is about 873.4057138341.

The spelling of 666266667 in words is "six hundred sixty-six million, two hundred sixty-six thousand, six hundred sixty-seven".