6446438442679 has 4 divisors (see below), whose sum is σ = 6603668648640. Its totient is φ = 6289208236720.

The previous prime is 6446438442659. The next prime is 6446438442709. The reversal of 6446438442679 is 9762448346446.

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 6446438442679 - 2⁷ = 6446438442551 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 (6446438442659) 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, 78615102919 + ... + 78615103000.

It is an arithmetic number, because the mean of its divisors is an integer number (1650917162160).

Almost surely, 2^{6446438442679} is an apocalyptic number.

6446438442679 is a deficient number, since it is larger than the sum of its proper divisors (157230205961).

6446438442679 is a wasteful number, since it uses less digits than its factorization.

6446438442679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157230205960.

The product of its digits is 668860416, while the sum is 67.

The spelling of 6446438442679 in words is "six trillion, four hundred forty-six billion, four hundred thirty-eight million, four hundred forty-two thousand, six hundred seventy-nine".