6420839017 has 4 divisors (see below), whose sum is σ = 6448396500. Its totient is φ = 6393281536.

The previous prime is 6420838981. The next prime is 6420839053. The reversal of 6420839017 is 7109380246.

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

It is an interprime number because it is at equal distance from previous prime (6420838981) and next prime (6420839053).

It can be written as a sum of positive squares in 2 ways, for example, as 2132684761 + 4288154256 = 46181^2 + 65484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420839017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420239017) 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, 13778392 + ... + 13778857.

It is an arithmetic number, because the mean of its divisors is an integer number (1612099125).

Almost surely, 2^6420839017 is an apocalyptic number.

It is an amenable number.

6420839017 is a deficient number, since it is larger than the sum of its proper divisors (27557483).

6420839017 is a wasteful number, since it uses less digits than its factorization.

6420839017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27557482.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6420839017 is about 80130.1380068698. The cubic root of 6420839017 is about 1858.6484783386.

The spelling of 6420839017 in words is "six billion, four hundred twenty million, eight hundred thirty-nine thousand, seventeen".