6442651321536 has 28 divisors (see below), whose sum is σ = 17046181622072. Its totient is φ = 2147550440448.

The previous prime is 6442651321487. The next prime is 6442651321649. The reversal of 6442651321536 is 6351231562446.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16777737625 + ... + 16777738008.

Almost surely, 2^{6442651321536} is an apocalyptic number.

It is an amenable number.

6442651321536 is an abundant number, since it is smaller than the sum of its proper divisors (10603530300536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6442651321536 is a wasteful number, since it uses less digits than its factorization.

6442651321536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33555475648 (or 33555475638 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 48.

The spelling of 6442651321536 in words is "six trillion, four hundred forty-two billion, six hundred fifty-one million, three hundred twenty-one thousand, five hundred thirty-six".