666323323667 has 4 divisors (see below), whose sum is σ = 666325185576. Its totient is φ = 666321461760.

The previous prime is 666323323661. The next prime is 666323323681. The reversal of 666323323667 is 766323323666.

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 666323323667 - 2¹⁶ = 666323258131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666323323661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205934 + ... + 1172627.

It is an arithmetic number, because the mean of its divisors is an integer number (166581296394).

Almost surely, 2^666323323667 is an apocalyptic number.

666323323667 is a deficient number, since it is larger than the sum of its proper divisors (1861909).

666323323667 is a wasteful number, since it uses less digits than its factorization.

666323323667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861908.

The product of its digits is 17635968, while the sum is 53.

Subtracting 666323323667 from its reverse (766323323666), we obtain a palindrome (99999999999).

The spelling of 666323323667 in words is "six hundred sixty-six billion, three hundred twenty-three million, three hundred twenty-three thousand, six hundred sixty-seven".