6447556953616 has 45 divisors (see below), whose sum is σ = 12523647902031. Its totient is φ = 3215668259232.

The previous prime is 6447556953587. The next prime is 6447556953709. The reversal of 6447556953616 is 6163596557446.

It is a happy number.

The square root of 6447556953616 is 2539204.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

Its product of digits (489888000) is a multiple of the sum of its prime divisors (1600).

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 8 ways as a sum of consecutive naturals, for example, 7505886595 + ... + 7505887453.

Almost surely, 2^{6447556953616} is an apocalyptic number.

6447556953616 is the 2539204-th square number.

It is an amenable number.

6447556953616 is a deficient number, since it is larger than the sum of its proper divisors (6076090948415).

6447556953616 is an frugal number, since it uses more digits than its factorization.

6447556953616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204 (or 1600 counting only the distinct ones).

The product of its digits is 489888000, while the sum is 67.

The spelling of 6447556953616 in words is "six trillion, four hundred forty-seven billion, five hundred fifty-six million, nine hundred fifty-three thousand, six hundred sixteen".