6445502444521 has 32 divisors (see below), whose sum is σ = 7452688269312. Its totient is φ = 5460176718720.

The previous prime is 6445502444477. The next prime is 6445502444531. The reversal of 6445502444521 is 1254442055446.

It is not a de Polignac number, because 6445502444521 - 2¹⁵ = 6445502411753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6445502444531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 582191416 + ... + 582202486.

It is an arithmetic number, because the mean of its divisors is an integer number (232896508416).

Almost surely, 2^{6445502444521} is an apocalyptic number.

It is an amenable number.

6445502444521 is a deficient number, since it is larger than the sum of its proper divisors (1007185824791).

6445502444521 is a wasteful number, since it uses less digits than its factorization.

6445502444521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12949.

The product of its (nonzero) digits is 3072000, while the sum is 46.

Adding to 6445502444521 its reverse (1254442055446), we get a palindrome (7699944499967).

The spelling of 6445502444521 in words is "six trillion, four hundred forty-five billion, five hundred two million, four hundred forty-four thousand, five hundred twenty-one".