16561016066 has 8 divisors (see below), whose sum is σ = 28390313280. Its totient is φ = 7097578308.

The previous prime is 16561016041. The next prime is 16561016077. The reversal of 16561016066 is 66061016561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591464846 + ... + 591464873.

It is an arithmetic number, because the mean of its divisors is an integer number (3548789160).

Almost surely, 2^16561016066 is an apocalyptic number.

16561016066 is a deficient number, since it is larger than the sum of its proper divisors (11829297214).

16561016066 is a wasteful number, since it uses less digits than its factorization.

16561016066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182929728.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 16561016066 in words is "sixteen billion, five hundred sixty-one million, sixteen thousand, sixty-six".