6446865042880 has 56 divisors (see below), whose sum is σ = 15846810226560. Its totient is φ = 2495560657920.

The previous prime is 6446865042823. The next prime is 6446865042883. The reversal of 6446865042880 is 882405686446.

It is a super-2 number, since 2×6446865042880² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446865042883) 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, 324932875 + ... + 324952714.

Almost surely, 2^{6446865042880} is an apocalyptic number.

It is an amenable number.

6446865042880 is an abundant number, since it is smaller than the sum of its proper divisors (9399945183680).

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

6446865042880 is a wasteful number, since it uses less digits than its factorization.

6446865042880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649885637 (or 649885627 counting only the distinct ones).

The product of its (nonzero) digits is 70778880, while the sum is 61.

The spelling of 6446865042880 in words is "six trillion, four hundred forty-six billion, eight hundred sixty-five million, forty-two thousand, eight hundred eighty".