6445846856 has 32 divisors (see below), whose sum is σ = 12482744760. Its totient is φ = 3118781952.

The previous prime is 6445846817. The next prime is 6445846859. The reversal of 6445846856 is 6586485446.

It can be written as a sum of positive squares in 4 ways, for example, as 4851122500 + 1594724356 = 69650^2 + 39934^2 .

It is not an unprimeable number, because it can be changed into a prime (6445846859) 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, 73175 + ... + 135078.

Almost surely, 2^6445846856 is an apocalyptic number.

It is an amenable number.

6445846856 is a deficient number, since it is larger than the sum of its proper divisors (6036897904).

6445846856 is a wasteful number, since it uses less digits than its factorization.

6445846856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208385 (or 208381 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 56.

The square root of 6445846856 is about 80286.0315123372. The cubic root of 6445846856 is about 1861.0583694070.

The spelling of 6445846856 in words is "six billion, four hundred forty-five million, eight hundred forty-six thousand, eight hundred fifty-six".