6720279665 has 32 divisors (see below), whose sum is σ = 9092431872. Its totient is φ = 4723992000.

The previous prime is 6720279647. The next prime is 6720279667. The reversal of 6720279665 is 5669720276.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-6720279665 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6720279667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1755944 + ... + 1759766.

It is an arithmetic number, because the mean of its divisors is an integer number (284138496).

Almost surely, 2^6720279665 is an apocalyptic number.

It is an amenable number.

6720279665 is a deficient number, since it is larger than the sum of its proper divisors (2372152207).

6720279665 is a wasteful number, since it uses less digits than its factorization.

6720279665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4901.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The square root of 6720279665 is about 81977.3118917667. The cubic root of 6720279665 is about 1887.1037698168.

The spelling of 6720279665 in words is "six billion, seven hundred twenty million, two hundred seventy-nine thousand, six hundred sixty-five".