6817205138 has 4 divisors (see below), whose sum is σ = 10225807710. Its totient is φ = 3408602568.

The previous prime is 6817205123. The next prime is 6817205141. The reversal of 6817205138 is 8315027186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4349798209 + 2467406929 = 65953^2 + 49673^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6817205095 and 6817205104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1704301283 + ... + 1704301286.

Almost surely, 2^6817205138 is an apocalyptic number.

6817205138 is a deficient number, since it is larger than the sum of its proper divisors (3408602572).

6817205138 is a wasteful number, since it uses less digits than its factorization.

6817205138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408602571.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 6817205138 is about 82566.3680804721. The cubic root of 6817205138 is about 1896.1329601147.

The spelling of 6817205138 in words is "six billion, eight hundred seventeen million, two hundred five thousand, one hundred thirty-eight".