6720812617 has 4 divisors (see below), whose sum is σ = 6937613056. Its totient is φ = 6504012180.

The previous prime is 6720812573. The next prime is 6720812689. The reversal of 6720812617 is 7162180276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6720812617 - 2⁷ = 6720812489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6720812617.

It is not an unprimeable number, because it can be changed into a prime (6720812717) 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, 108400173 + ... + 108400234.

It is an arithmetic number, because the mean of its divisors is an integer number (1734403264).

Almost surely, 2^6720812617 is an apocalyptic number.

It is an amenable number.

6720812617 is a deficient number, since it is larger than the sum of its proper divisors (216800439).

6720812617 is a wasteful number, since it uses less digits than its factorization.

6720812617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216800438.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 6720812617 is about 81980.5624340307. The cubic root of 6720812617 is about 1887.1536541070.

The spelling of 6720812617 in words is "six billion, seven hundred twenty million, eight hundred twelve thousand, six hundred seventeen".