6644421463679 has 4 divisors (see below), whose sum is σ = 6661769822976. Its totient is φ = 6627073104384.

The previous prime is 6644421463643. The next prime is 6644421463697. The reversal of 6644421463679 is 9763641244466.

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 6644421463679 - 2¹² = 6644421459583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644421463079) 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, 8674179074 + ... + 8674179839.

It is an arithmetic number, because the mean of its divisors is an integer number (1665442455744).

Almost surely, 2^{6644421463679} is an apocalyptic number.

6644421463679 is a deficient number, since it is larger than the sum of its proper divisors (17348359297).

6644421463679 is a wasteful number, since it uses less digits than its factorization.

6644421463679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17348359296.

The product of its digits is 125411328, while the sum is 62.

The spelling of 6644421463679 in words is "six trillion, six hundred forty-four billion, four hundred twenty-one million, four hundred sixty-three thousand, six hundred seventy-nine".