16005516661111 has 2 divisors, whose sum is σ = 16005516661112. Its totient is φ = 16005516661110.

The previous prime is 16005516661061. The next prime is 16005516661129. The reversal of 16005516661111 is 11116661550061.

16005516661111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (11116661550061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16005516661111 - 2⁷ = 16005516660983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16005516661811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002758330555 + 8002758330556.

It is an arithmetic number, because the mean of its divisors is an integer number (8002758330556).

Almost surely, 2^{16005516661111} is an apocalyptic number.

16005516661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

16005516661111 is an equidigital number, since it uses as much as digits as its factorization.

16005516661111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 16005516661111 in words is "sixteen trillion, five billion, five hundred sixteen million, six hundred sixty-one thousand, one hundred eleven".