6720431081 has 16 divisors (see below), whose sum is σ = 8706633600. Its totient is φ = 5037406848.

The previous prime is 6720431077. The next prime is 6720431083. The reversal of 6720431081 is 1801340276.

It is a cyclic number.

It is not a de Polignac number, because 6720431081 - 2² = 6720431077 is a prime.

It is a super-2 number, since 2×6720431081² = 90328387828941657122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6720431083) 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, 1941716 + ... + 1945173.

It is an arithmetic number, because the mean of its divisors is an integer number (544164600).

Almost surely, 2^6720431081 is an apocalyptic number.

It is an amenable number.

6720431081 is a deficient number, since it is larger than the sum of its proper divisors (1986202519).

6720431081 is a wasteful number, since it uses less digits than its factorization.

6720431081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886928.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6720431081 is about 81978.2354103819. The cubic root of 6720431081 is about 1887.1179426178.

The spelling of 6720431081 in words is "six billion, seven hundred twenty million, four hundred thirty-one thousand, eighty-one".