16658085661 has 16 divisors (see below), whose sum is σ = 19294329600. Its totient is φ = 14087006208.

The previous prime is 16658085643. The next prime is 16658085671.

16658085661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 16658085661 - 2¹⁷ = 16657954589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16658085599 and 16658085608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16658085671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151005 + ... + 236893.

It is an arithmetic number, because the mean of its divisors is an integer number (1205895600).

Almost surely, 2^16658085661 is an apocalyptic number.

It is an amenable number.

16658085661 is a deficient number, since it is larger than the sum of its proper divisors (2636243939).

16658085661 is a wasteful number, since it uses less digits than its factorization.

16658085661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86268.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 16658085661 in words is "sixteen billion, six hundred fifty-eight million, eighty-five thousand, six hundred sixty-one".