6721545886 has 24 divisors (see below), whose sum is σ = 11090396520. Its totient is φ = 3052993680.

The previous prime is 6721545851. The next prime is 6721545889. The reversal of 6721545886 is 6885451276.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721545889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343560 + ... + 362596.

It is an arithmetic number, because the mean of its divisors is an integer number (462099855).

Almost surely, 2^6721545886 is an apocalyptic number.

6721545886 is a deficient number, since it is larger than the sum of its proper divisors (4368850634).

6721545886 is a wasteful number, since it uses less digits than its factorization.

6721545886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20520 (or 20509 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 52.

The square root of 6721545886 is about 81985.0345246009. The cubic root of 6721545886 is about 1887.2222837519. Note that the first 4 decimals are identical.

The spelling of 6721545886 in words is "six billion, seven hundred twenty-one million, five hundred forty-five thousand, eight hundred eighty-six".