16520785765356 has 192 divisors, whose sum is σ = 41807631810560. Its totient is φ = 5067267102720.

The previous prime is 16520785765343. The next prime is 16520785765381. The reversal of 16520785765356 is 65356758702561.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109444725 + ... + 109595571.

Almost surely, 2^{16520785765356} is an apocalyptic number.

It is an amenable number.

16520785765356 is an abundant number, since it is smaller than the sum of its proper divisors (25286846045204).

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

16520785765356 is a wasteful number, since it uses less digits than its factorization.

16520785765356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151104 (or 151102 counting only the distinct ones).

The product of its (nonzero) digits is 317520000, while the sum is 66.

The spelling of 16520785765356 in words is "sixteen trillion, five hundred twenty billion, seven hundred eighty-five million, seven hundred sixty-five thousand, three hundred fifty-six".