16661516211 has 10 divisors (see below), whose sum is σ = 24889425572. Its totient is φ = 11107677420.

The previous prime is 16661516173. The next prime is 16661516231. The reversal of 16661516211 is 11261516661.

It is not a de Polignac number, because 16661516211 - 2⁶ = 16661516147 is a prime.

It is a super-2 number, since 2×16661516211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661516231) 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 9 ways as a sum of consecutive naturals, for example, 102848785 + ... + 102848946.

Almost surely, 2^16661516211 is an apocalyptic number.

16661516211 is a deficient number, since it is larger than the sum of its proper divisors (8227909361).

16661516211 is an equidigital number, since it uses as much as digits as its factorization.

16661516211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205697743 (or 205697734 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The spelling of 16661516211 in words is "sixteen billion, six hundred sixty-one million, five hundred sixteen thousand, two hundred eleven".