6421805332639 has 8 divisors (see below), whose sum is σ = 6488309439248. Its totient is φ = 6355307347200.

The previous prime is 6421805332627. The next prime is 6421805332651. The reversal of 6421805332639 is 9362335081246.

It is an interprime number because it is at equal distance from previous prime (6421805332627) and next prime (6421805332651).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421805332639 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 (6421805332699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593989 + ... + 3632689.

It is an arithmetic number, because the mean of its divisors is an integer number (811038679906).

Almost surely, 2^{6421805332639} is an apocalyptic number.

6421805332639 is a deficient number, since it is larger than the sum of its proper divisors (66504106609).

6421805332639 is a wasteful number, since it uses less digits than its factorization.

6421805332639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060585.

The product of its (nonzero) digits is 5598720, while the sum is 52.

The spelling of 6421805332639 in words is "six trillion, four hundred twenty-one billion, eight hundred five million, three hundred thirty-two thousand, six hundred thirty-nine".