638353651334 has 16 divisors (see below), whose sum is σ = 1094788059936. Its totient is φ = 273463257600.

The previous prime is 638353651297. The next prime is 638353651349. The reversal of 638353651334 is 433156353836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9705947 + ... + 9771494.

It is an arithmetic number, because the mean of its divisors is an integer number (68424253746).

Almost surely, 2^638353651334 is an apocalyptic number.

638353651334 is a deficient number, since it is larger than the sum of its proper divisors (456434408602).

638353651334 is a wasteful number, since it uses less digits than its factorization.

638353651334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19479791.

The product of its digits is 6998400, while the sum is 50.

The spelling of 638353651334 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred fifty-one thousand, three hundred thirty-four".