666342424243667 has 4 divisors (see below), whose sum is σ = 666342518070240. Its totient is φ = 666342330417096.

The previous prime is 666342424243649. The next prime is 666342424243711. The reversal of 666342424243667 is 766342424243666.

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 666342424243667 - 2⁸ = 666342424243411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666342424248667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35302667 + ... + 50783492.

It is an arithmetic number, because the mean of its divisors is an integer number (166585629517560).

Almost surely, 2^{666342424243667} is an apocalyptic number.

666342424243667 is a deficient number, since it is larger than the sum of its proper divisors (93826573).

666342424243667 is an equidigital number, since it uses as much as digits as its factorization.

666342424243667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93826572.

The product of its digits is 1003290624, while the sum is 65.

Subtracting 666342424243667 from its reverse (766342424243666), we obtain a palindrome (99999999999999).

The spelling of 666342424243667 in words is "six hundred sixty-six trillion, three hundred forty-two billion, four hundred twenty-four million, two hundred forty-three thousand, six hundred sixty-seven".