6721439481 has 16 divisors (see below), whose sum is σ = 10543435200. Its totient is φ = 4217373504.

The previous prime is 6721439471. The next prime is 6721439507. The reversal of 6721439481 is 1849341276.

It is not a de Polignac number, because 6721439481 - 2¹⁹ = 6720915193 is a prime.

It is a super-2 number, since 2×6721439481² = 90355497393491098722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6721439441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7321371 + ... + 7322288.

It is an arithmetic number, because the mean of its divisors is an integer number (658964700).

Almost surely, 2^6721439481 is an apocalyptic number.

It is an amenable number.

6721439481 is a deficient number, since it is larger than the sum of its proper divisors (3821995719).

6721439481 is a wasteful number, since it uses less digits than its factorization.

6721439481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14643685 (or 14643679 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 6721439481 is about 81984.3855926237. The cubic root of 6721439481 is about 1887.2123251823.

The spelling of 6721439481 in words is "six billion, seven hundred twenty-one million, four hundred thirty-nine thousand, four hundred eighty-one".