668200733549 has 4 divisors (see below), whose sum is σ = 683740285536. Its totient is φ = 652661181564.

The previous prime is 668200733533. The next prime is 668200733581. The reversal of 668200733549 is 945337002866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668200733549 - 2⁴ = 668200733533 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 668200733549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668200733509) 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, 7769775929 + ... + 7769776014.

It is an arithmetic number, because the mean of its divisors is an integer number (170935071384).

Almost surely, 2^668200733549 is an apocalyptic number.

It is an amenable number.

668200733549 is a deficient number, since it is larger than the sum of its proper divisors (15539551987).

668200733549 is a wasteful number, since it uses less digits than its factorization.

668200733549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15539551986.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 668200733549 in words is "six hundred sixty-eight billion, two hundred million, seven hundred thirty-three thousand, five hundred forty-nine".