6649138196 has 6 divisors (see below), whose sum is σ = 11635991850. Its totient is φ = 3324569096.

The previous prime is 6649138187. The next prime is 6649138201. The reversal of 6649138196 is 6918319466.

It can be written as a sum of positive squares in only one way, i.e., 6564240400 + 84897796 = 81020^2 + 9214^2 .

It is a super-2 number, since 2×6649138196² = 88422077499012268832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831142271 + ... + 831142278.

It is an arithmetic number, because the mean of its divisors is an integer number (1939331975).

Almost surely, 2^6649138196 is an apocalyptic number.

It is an amenable number.

6649138196 is a deficient number, since it is larger than the sum of its proper divisors (4986853654).

6649138196 is a wasteful number, since it uses less digits than its factorization.

6649138196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662284553 (or 1662284551 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 6649138196 is about 81542.2479209397. The cubic root of 6649138196 is about 1880.4211177500.

The spelling of 6649138196 in words is "six billion, six hundred forty-nine million, one hundred thirty-eight thousand, one hundred ninety-six".