16566661116 has 36 divisors (see below), whose sum is σ = 41880750912. Its totient is φ = 5521704384.

The previous prime is 16566661103. The next prime is 16566661121. The reversal of 16566661116 is 61116666561.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 710800 + ... + 733736.

It is an arithmetic number, because the mean of its divisors is an integer number (1163354192).

Almost surely, 2^16566661116 is an apocalyptic number.

It is an amenable number.

16566661116 is an abundant number, since it is smaller than the sum of its proper divisors (25314089796).

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

16566661116 is a wasteful number, since it uses less digits than its factorization.

16566661116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43010 (or 43005 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 16566661116 in words is "sixteen billion, five hundred sixty-six million, six hundred sixty-one thousand, one hundred sixteen".