6721389969 has 16 divisors (see below), whose sum is σ = 10243263360. Its totient is φ = 3840364800.

The previous prime is 6721389949. The next prime is 6721389979. The reversal of 6721389969 is 9699831276.

It is not a de Polignac number, because 6721389969 - 2¹⁷ = 6721258897 is a prime.

It is a super-2 number, since 2×6721389969² = 90354166230747641922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6721389949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358119 + ... + 376419.

It is an arithmetic number, because the mean of its divisors is an integer number (640203960).

Almost surely, 2^6721389969 is an apocalyptic number.

It is an amenable number.

6721389969 is a deficient number, since it is larger than the sum of its proper divisors (3521873391).

6721389969 is a wasteful number, since it uses less digits than its factorization.

6721389969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35800.

The product of its digits is 8817984, while the sum is 60.

The square root of 6721389969 is about 81984.0836321295. The cubic root of 6721389969 is about 1887.2076912600.

The spelling of 6721389969 in words is "six billion, seven hundred twenty-one million, three hundred eighty-nine thousand, nine hundred sixty-nine".