638653428735 has 32 divisors (see below), whose sum is σ = 1172164815360. Its totient is φ = 290870502528.

The previous prime is 638653428713. The next prime is 638653428793. The reversal of 638653428735 is 537824356836.

It is not a de Polignac number, because 638653428735 - 2¹³ = 638653420543 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11277357 + ... + 11333846.

It is an arithmetic number, because the mean of its divisors is an integer number (36630150480).

Almost surely, 2^638653428735 is an apocalyptic number.

638653428735 is a deficient number, since it is larger than the sum of its proper divisors (533511386625).

638653428735 is a wasteful number, since it uses less digits than its factorization.

638653428735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22611487.

The product of its digits is 87091200, while the sum is 60.

The spelling of 638653428735 in words is "six hundred thirty-eight billion, six hundred fifty-three million, four hundred twenty-eight thousand, seven hundred thirty-five".