1016721056640 has 512 divisors, whose sum is σ = 3548808806400. Its totient is φ = 246636748800.

The previous prime is 1016721056623. The next prime is 1016721056669. The reversal of 1016721056640 is 466501276101.

It is a congruent number.

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 in 63 ways as a sum of consecutive naturals, for example, 148141849 + ... + 148148711.

It is an arithmetic number, because the mean of its divisors is an integer number (6931267200).

Almost surely, 2^{1016721056640} is an apocalyptic number.

1016721056640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1016721056640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1774404403200).

1016721056640 is an abundant number, since it is smaller than the sum of its proper divisors (2532087749760).

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

1016721056640 is a wasteful number, since it uses less digits than its factorization.

1016721056640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066 (or 7054 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 1016721056640 in words is "one trillion, sixteen billion, seven hundred twenty-one million, fifty-six thousand, six hundred forty".