921512705568 has 768 divisors, whose sum is σ = 3197756620800. Its totient is φ = 225833287680.

The previous prime is 921512705543. The next prime is 921512705569. The reversal of 921512705568 is 865507215129.

It is a self number, because there is not a number n which added to its sum of digits gives 921512705568.

It is not an unprimeable number, because it can be changed into a prime (921512705569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 820580655 + ... + 820581777.

It is an arithmetic number, because the mean of its divisors is an integer number (4163745600).

Almost surely, 2^921512705568 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 921512705568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598878310400).

921512705568 is an abundant number, since it is smaller than the sum of its proper divisors (2276243915232).

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

921512705568 is a wasteful number, since it uses less digits than its factorization.

921512705568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 51.

The spelling of 921512705568 in words is "nine hundred twenty-one billion, five hundred twelve million, seven hundred five thousand, five hundred sixty-eight".