1016721056568 has 128 divisors (see below), whose sum is σ = 2942443929600. Its totient is φ = 286740964224.

The previous prime is 1016721056539. The next prime is 1016721056599. The reversal of 1016721056568 is 8656501276101.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 70958221 + ... + 70972547.

It is an arithmetic number, because the mean of its divisors is an integer number (22987843200).

Almost surely, 2^{1016721056568} 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 1016721056568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471221964800).

1016721056568 is an abundant number, since it is smaller than the sum of its proper divisors (1925722873032).

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

1016721056568 is a wasteful number, since it uses less digits than its factorization.

1016721056568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19769 (or 19765 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 1016721056568 in words is "one trillion, sixteen billion, seven hundred twenty-one million, fifty-six thousand, five hundred sixty-eight".