16661054105011 has 4 divisors (see below), whose sum is σ = 16661190346024. Its totient is φ = 16660917864000.

The previous prime is 16661054104967. The next prime is 16661054105051. The reversal of 16661054105011 is 11050145016661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661054105011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661054105051) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 67936905 + ... + 68181706.

It is an arithmetic number, because the mean of its divisors is an integer number (4165297586506).

Almost surely, 2^{16661054105011} is an apocalyptic number.

16661054105011 is a deficient number, since it is larger than the sum of its proper divisors (136241013).

16661054105011 is a wasteful number, since it uses less digits than its factorization.

16661054105011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136241012.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 16661054105011 in words is "sixteen trillion, six hundred sixty-one billion, fifty-four million, one hundred five thousand, eleven".