666623267 has 4 divisors (see below), whose sum is σ = 676572936. Its totient is φ = 656673600.

The previous prime is 666623263. The next prime is 666623291. The reversal of 666623267 is 762326666.

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

It is a cyclic number.

It is not a de Polignac number, because 666623267 - 2² = 666623263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666623263) 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, 4974734 + ... + 4974867.

It is an arithmetic number, because the mean of its divisors is an integer number (169143234).

Almost surely, 2^666623267 is an apocalyptic number.

666623267 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

666623267 is a deficient number, since it is larger than the sum of its proper divisors (9949669).

666623267 is an equidigital number, since it uses as much as digits as its factorization.

666623267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9949668.

The product of its digits is 653184, while the sum is 44.

The square root of 666623267 is about 25819.0485301066. The cubic root of 666623267 is about 873.5615077744.

The spelling of 666623267 in words is "six hundred sixty-six million, six hundred twenty-three thousand, two hundred sixty-seven".