16661116616 has 8 divisors (see below), whose sum is σ = 31239593670. Its totient is φ = 8330558304.

The previous prime is 16661116609. The next prime is 16661116639. The reversal of 16661116616 is 61661116661.

It can be written as a sum of positive squares in only one way, i.e., 14005775716 + 2655340900 = 118346^2 + 51530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1041319781 + ... + 1041319796.

Almost surely, 2^16661116616 is an apocalyptic number.

It is an amenable number.

16661116616 is a deficient number, since it is larger than the sum of its proper divisors (14578477054).

16661116616 is a wasteful number, since it uses less digits than its factorization.

16661116616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082639583 (or 2082639579 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The spelling of 16661116616 in words is "sixteen billion, six hundred sixty-one million, one hundred sixteen thousand, six hundred sixteen".