638447163223 has 8 divisors (see below), whose sum is σ = 659404207728. Its totient is φ = 617820151104.

The previous prime is 638447163217. The next prime is 638447163227. The reversal of 638447163223 is 322361744836.

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

It is a cyclic number.

It is not a de Polignac number, because 638447163223 - 2⁹ = 638447162711 is a prime.

It is a super-2 number, since 2×638447163223² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638447163227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82504165 + ... + 82511902.

It is an arithmetic number, because the mean of its divisors is an integer number (82425525966).

Almost surely, 2^638447163223 is an apocalyptic number.

638447163223 is a deficient number, since it is larger than the sum of its proper divisors (20957044505).

638447163223 is a wasteful number, since it uses less digits than its factorization.

638447163223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165016193.

The product of its digits is 3483648, while the sum is 49.

The spelling of 638447163223 in words is "six hundred thirty-eight billion, four hundred forty-seven million, one hundred sixty-three thousand, two hundred twenty-three".