6720786811 has 4 divisors (see below), whose sum is σ = 6720958800. Its totient is φ = 6720614824.

The previous prime is 6720786797. The next prime is 6720786857. The reversal of 6720786811 is 1186870276.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6720786811 - 2⁹ = 6720786299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6720786011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4050 + ... + 116008.

It is an arithmetic number, because the mean of its divisors is an integer number (1680239700).

Almost surely, 2^6720786811 is an apocalyptic number.

6720786811 is a deficient number, since it is larger than the sum of its proper divisors (171989).

6720786811 is a wasteful number, since it uses less digits than its factorization.

6720786811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171988.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 6720786811 is about 81980.4050429125. The cubic root of 6720786811 is about 1887.1512387270.

The spelling of 6720786811 in words is "six billion, seven hundred twenty million, seven hundred eighty-six thousand, eight hundred eleven".