6689791312 has 20 divisors (see below), whose sum is σ = 13723910676. Its totient is φ = 3148136960.

The previous prime is 6689791271. The next prime is 6689791319. The reversal of 6689791312 is 2131979866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3433491216 + 3256300096 = 58596^2 + 57064^2 .

It is a super-2 number, since 2×6689791312² = 89506615596221362688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6689791312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689791319) 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, 12297139 + ... + 12297682.

Almost surely, 2^6689791312 is an apocalyptic number.

It is an amenable number.

6689791312 is an abundant number, since it is smaller than the sum of its proper divisors (7034119364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6689791312 is a wasteful number, since it uses less digits than its factorization.

6689791312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24594846 (or 24594840 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 6689791312 is about 81791.1444595318. The cubic root of 6689791312 is about 1884.2456589495.

The spelling of 6689791312 in words is "six billion, six hundred eighty-nine million, seven hundred ninety-one thousand, three hundred twelve".