638613841682 has 16 divisors (see below), whose sum is σ = 965428200000. Its totient is φ = 316805427120.

The previous prime is 638613841681. The next prime is 638613841687. The reversal of 638613841682 is 286148316836.

It is a super-3 number, since 3×638613841682³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (638613841681) 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, 1065944 + ... + 1553532.

It is an arithmetic number, because the mean of its divisors is an integer number (60339262500).

Almost surely, 2^638613841682 is an apocalyptic number.

638613841682 is a deficient number, since it is larger than the sum of its proper divisors (326814358318).

638613841682 is a wasteful number, since it uses less digits than its factorization.

638613841682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492721.

The product of its digits is 7962624, while the sum is 56.

The spelling of 638613841682 in words is "six hundred thirty-eight billion, six hundred thirteen million, eight hundred forty-one thousand, six hundred eighty-two".