638405163803 has 8 divisors (see below), whose sum is σ = 707859079536. Its totient is φ = 570854095200.

The previous prime is 638405163779. The next prime is 638405163833. The reversal of 638405163803 is 308361504836.

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 638405163803 - 2¹⁰ = 638405162779 is a prime.

It is a super-2 number, since 2×638405163803² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638405163833) 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, 475711076 + ... + 475712417.

It is an arithmetic number, because the mean of its divisors is an integer number (88482384942).

Almost surely, 2^638405163803 is an apocalyptic number.

638405163803 is a deficient number, since it is larger than the sum of its proper divisors (69453915733).

638405163803 is a wasteful number, since it uses less digits than its factorization.

638405163803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951423565.

The product of its (nonzero) digits is 1244160, while the sum is 47.

It can be divided in two parts, 638405 and 163803, that added together give a palindrome (802208).

The spelling of 638405163803 in words is "six hundred thirty-eight billion, four hundred five million, one hundred sixty-three thousand, eight hundred three".