16561028859264 has 256 divisors, whose sum is σ = 54477072288000. Its totient is φ = 4922163044352.

The previous prime is 16561028859259. The next prime is 16561028859289. The reversal of 16561028859264 is 46295882016561.

16561028859264 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 10 + 28 + 8 + 592 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6301614 + ... + 8534189.

It is an arithmetic number, because the mean of its divisors is an integer number (212801063625).

Almost surely, 2^{16561028859264} is an apocalyptic number.

It is an amenable number.

16561028859264 is an abundant number, since it is smaller than the sum of its proper divisors (37916043428736).

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

16561028859264 is a wasteful number, since it uses less digits than its factorization.

16561028859264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14835862 (or 14835844 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 16561028859264 in words is "sixteen trillion, five hundred sixty-one billion, twenty-eight million, eight hundred fifty-nine thousand, two hundred sixty-four".