16561016511066 has 48 divisors (see below), whose sum is σ = 36833978465856. Its totient is φ = 5374732079808.

The previous prime is 16561016510999. The next prime is 16561016511071. The reversal of 16561016511066 is 66011561016561.

16561016511066 is a `hidden beast` number, since 1 + 6 + 5 + 61 + 0 + 16 + 511 + 0 + 66 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 33937710 + ... + 34422233.

It is an arithmetic number, because the mean of its divisors is an integer number (767374551372).

Almost surely, 2^{16561016511066} is an apocalyptic number.

16561016511066 is an abundant number, since it is smaller than the sum of its proper divisors (20272961954790).

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

16561016511066 is a wasteful number, since it uses less digits than its factorization.

16561016511066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68360307 (or 68360304 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 16561016511066 in words is "sixteen trillion, five hundred sixty-one billion, sixteen million, five hundred eleven thousand, sixty-six".