666837738667 has 8 divisors (see below), whose sum is σ = 669197849040. Its totient is φ = 664478201760.

The previous prime is 666837738643. The next prime is 666837738683. The reversal of 666837738667 is 766837738666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666837738667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666837738667.

It is not an unprimeable number, because it can be changed into a prime (666837738067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2257317 + ... + 2535577.

It is an arithmetic number, because the mean of its divisors is an integer number (83649731130).

Almost surely, 2^666837738667 is an apocalyptic number.

666837738667 is a deficient number, since it is larger than the sum of its proper divisors (2360110373).

666837738667 is a wasteful number, since it uses less digits than its factorization.

666837738667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286733.

The product of its digits is 1536288768, while the sum is 73.

Subtracting 666837738667 from its reverse (766837738666), we obtain a palindrome (99999999999).

The spelling of 666837738667 in words is "six hundred sixty-six billion, eight hundred thirty-seven million, seven hundred thirty-eight thousand, six hundred sixty-seven".