666226567 has 4 divisors (see below), whose sum is σ = 677148376. Its totient is φ = 655304760.

The previous prime is 666226529. The next prime is 666226571. The reversal of 666226567 is 765622666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666226567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666226577) 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 3 ways as a sum of consecutive naturals, for example, 5460813 + ... + 5460934.

It is an arithmetic number, because the mean of its divisors is an integer number (169287094).

Almost surely, 2^666226567 is an apocalyptic number.

666226567 is a deficient number, since it is larger than the sum of its proper divisors (10921809).

666226567 is a wasteful number, since it uses less digits than its factorization.

666226567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921808.

The product of its digits is 1088640, while the sum is 46.

The square root of 666226567 is about 25811.3650743234. The cubic root of 666226567 is about 873.3881911847.

The spelling of 666226567 in words is "six hundred sixty-six million, two hundred twenty-six thousand, five hundred sixty-seven".