4521278447616 has 448 divisors, whose sum is σ = 13945545123840. Its totient is φ = 1276213985280.

The previous prime is 4521278447591. The next prime is 4521278447617. The reversal of 4521278447616 is 6167448721254.

It is a tau number, because it is divible by the number of its divisors (448).

It is not an unprimeable number, because it can be changed into a prime (4521278447617) 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, 9893388060 + ... + 9893388516.

Almost surely, 2^{4521278447616} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4521278447616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6972772561920).

4521278447616 is an abundant number, since it is smaller than the sum of its proper divisors (9424266676224).

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

4521278447616 is a wasteful number, since it uses less digits than its factorization.

4521278447616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1039 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 57.

The spelling of 4521278447616 in words is "four trillion, five hundred twenty-one billion, two hundred seventy-eight million, four hundred forty-seven thousand, six hundred sixteen".