638613784106 has 8 divisors (see below), whose sum is σ = 957945257220. Its totient is φ = 319298698368.

The previous prime is 638613784079. The next prime is 638613784147. The reversal of 638613784106 is 601487316836.

It can be written as a sum of positive squares in 2 ways, for example, as 635169150625 + 3444633481 = 796975^2 + 58691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3998951 + ... + 4155578.

Almost surely, 2^638613784106 is an apocalyptic number.

638613784106 is a deficient number, since it is larger than the sum of its proper divisors (319331473114).

638613784106 is a wasteful number, since it uses less digits than its factorization.

638613784106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193688.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 638613784106 in words is "six hundred thirty-eight billion, six hundred thirteen million, seven hundred eighty-four thousand, one hundred six".