6689021543 has 4 divisors (see below), whose sum is σ = 6769612248. Its totient is φ = 6608430840.

The previous prime is 6689021539. The next prime is 6689021557. The reversal of 6689021543 is 3451209866.

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

It is a cyclic number.

It is not a de Polignac number, because 6689021543 - 2² = 6689021539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6689021494 and 6689021503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689021533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40295228 + ... + 40295393.

It is an arithmetic number, because the mean of its divisors is an integer number (1692403062).

Almost surely, 2^6689021543 is an apocalyptic number.

6689021543 is a deficient number, since it is larger than the sum of its proper divisors (80590705).

6689021543 is an equidigital number, since it uses as much as digits as its factorization.

6689021543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80590704.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 6689021543 is about 81786.4386252391. The cubic root of 6689021543 is about 1884.1733851687.

The spelling of 6689021543 in words is "six billion, six hundred eighty-nine million, twenty-one thousand, five hundred forty-three".