6991338722 has 8 divisors (see below), whose sum is σ = 10487929836. Its totient is φ = 3495362112.

The previous prime is 6991338721. The next prime is 6991338733. The reversal of 6991338722 is 2278331996.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5665723441 + 1325615281 = 75271^2 + 36409^2 .

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

It is a super-4 number, since 4×6991338722⁴ (a number of 40 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (6991338721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124043 + ... + 171374.

Almost surely, 2^6991338722 is an apocalyptic number.

6991338722 is a deficient number, since it is larger than the sum of its proper divisors (3496591114).

6991338722 is a wasteful number, since it uses less digits than its factorization.

6991338722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307252.

The product of its digits is 979776, while the sum is 50.

The square root of 6991338722 is about 83614.2255958877. The cubic root of 6991338722 is about 1912.1418843446.

The spelling of 6991338722 in words is "six billion, nine hundred ninety-one million, three hundred thirty-eight thousand, seven hundred twenty-two".