638699996836 has 24 divisors (see below), whose sum is σ = 1224438203520. Its totient is φ = 289103455200.

The previous prime is 638699996827. The next prime is 638699996881.

638699996836 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×638699996836³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638699996836.

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, 30357495 + ... + 30378526.

It is an arithmetic number, because the mean of its divisors is an integer number (51018258480).

Almost surely, 2^638699996836 is an apocalyptic number.

It is an amenable number.

638699996836 is a deficient number, since it is larger than the sum of its proper divisors (585738206684).

638699996836 is a wasteful number, since it uses less digits than its factorization.

638699996836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60736275 (or 60736273 counting only the distinct ones).

The product of its digits is 4897760256, while the sum is 82.

The spelling of 638699996836 in words is "six hundred thirty-eight billion, six hundred ninety-nine million, nine hundred ninety-six thousand, eight hundred thirty-six".