664838655163 has 4 divisors (see below), whose sum is σ = 669691492200. Its totient is φ = 659985818128.

The previous prime is 664838655133. The next prime is 664838655181. The reversal of 664838655163 is 361556838466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664838655163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664838655133) 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, 2426418313 + ... + 2426418586.

It is an arithmetic number, because the mean of its divisors is an integer number (167422873050).

Almost surely, 2^664838655163 is an apocalyptic number.

664838655163 is a deficient number, since it is larger than the sum of its proper divisors (4852837037).

664838655163 is a wasteful number, since it uses less digits than its factorization.

664838655163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852837036.

The product of its digits is 74649600, while the sum is 61.

The spelling of 664838655163 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred fifty-five thousand, one hundred sixty-three".