668754218267 has 4 divisors (see below), whose sum is σ = 668786497656. Its totient is φ = 668721938880.

The previous prime is 668754218219. The next prime is 668754218273. The reversal of 668754218267 is 762812457866.

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 668754218267 - 2⁶ = 668754218203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668754218467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16108598 + ... + 16150059.

It is an arithmetic number, because the mean of its divisors is an integer number (167196624414).

Almost surely, 2^668754218267 is an apocalyptic number.

668754218267 is a deficient number, since it is larger than the sum of its proper divisors (32279389).

668754218267 is a wasteful number, since it uses less digits than its factorization.

668754218267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32279388.

The product of its digits is 54190080, while the sum is 62.

The spelling of 668754218267 in words is "six hundred sixty-eight billion, seven hundred fifty-four million, two hundred eighteen thousand, two hundred sixty-seven".