6691394543 has 8 divisors (see below), whose sum is σ = 6745198512. Its totient is φ = 6637804416.

The previous prime is 6691394539. The next prime is 6691394557. The reversal of 6691394543 is 3454931966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6691394543 - 2² = 6691394539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6691394491 and 6691394500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691394533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9671 + ... + 116087.

It is an arithmetic number, because the mean of its divisors is an integer number (843149814).

Almost surely, 2^6691394543 is an apocalyptic number.

6691394543 is a deficient number, since it is larger than the sum of its proper divisors (53803969).

6691394543 is a wasteful number, since it uses less digits than its factorization.

6691394543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106921.

The product of its digits is 2099520, while the sum is 50.

The square root of 6691394543 is about 81800.9446339099. The cubic root of 6691394543 is about 1884.3961688643.

The spelling of 6691394543 in words is "six billion, six hundred ninety-one million, three hundred ninety-four thousand, five hundred forty-three".