6391665379 has 16 divisors (see below), whose sum is σ = 7348423680. Its totient is φ = 5498249760.

The previous prime is 6391665377. The next prime is 6391665391. The reversal of 6391665379 is 9735661936.

It is a cyclic number.

It is not a de Polignac number, because 6391665379 - 2¹ = 6391665377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6391665377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162649 + ... + 198085.

It is an arithmetic number, because the mean of its divisors is an integer number (459276480).

Almost surely, 2^6391665379 is an apocalyptic number.

6391665379 is a deficient number, since it is larger than the sum of its proper divisors (956758301).

6391665379 is a wasteful number, since it uses less digits than its factorization.

6391665379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36330.

The product of its digits is 5511240, while the sum is 55.

The square root of 6391665379 is about 79947.8916482480. The cubic root of 6391665379 is about 1855.8292274187.

The spelling of 6391665379 in words is "six billion, three hundred ninety-one million, six hundred sixty-five thousand, three hundred seventy-nine".