6720813261 has 12 divisors (see below), whose sum is σ = 9710913888. Its totient is φ = 4479124104.

The previous prime is 6720813173. The next prime is 6720813301. The reversal of 6720813261 is 1623180276.

It is a de Polignac number, because none of the positive numbers 2^k-6720813261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720813161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87745 + ... + 145398.

It is an arithmetic number, because the mean of its divisors is an integer number (809242824).

Almost surely, 2^6720813261 is an apocalyptic number.

It is an amenable number.

6720813261 is a deficient number, since it is larger than the sum of its proper divisors (2990100627).

6720813261 is a wasteful number, since it uses less digits than its factorization.

6720813261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236352 (or 236349 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 6720813261 is about 81980.5663617909. The cubic root of 6720813261 is about 1887.1537143838.

The spelling of 6720813261 in words is "six billion, seven hundred twenty million, eight hundred thirteen thousand, two hundred sixty-one".