6478449615656 has 8 divisors (see below), whose sum is σ = 12147093029370. Its totient is φ = 3239224807824.

The previous prime is 6478449615647. The next prime is 6478449615661. The reversal of 6478449615656 is 6565169448746.

It can be written as a sum of positive squares in only one way, i.e., 5205014102500 + 1273435513156 = 2281450^2 + 1128466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6478449615656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404903100971 + ... + 404903100986.

Almost surely, 2^{6478449615656} is an apocalyptic number.

It is an amenable number.

6478449615656 is a deficient number, since it is larger than the sum of its proper divisors (5668643413714).

6478449615656 is a wasteful number, since it uses less digits than its factorization.

6478449615656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809806201963 (or 809806201959 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 71.

The spelling of 6478449615656 in words is "six trillion, four hundred seventy-eight billion, four hundred forty-nine million, six hundred fifteen thousand, six hundred fifty-six".