16666586658 has 24 divisors (see below), whose sum is σ = 36114365196. Its totient is φ = 5555001600.

The previous prime is 16666586641. The next prime is 16666586689. The reversal of 16666586658 is 85668566661.

It can be written as a sum of positive squares in 2 ways, for example, as 15641754489 + 1024832169 = 125067^2 + 32013^2 .

It is a super-2 number, since 2×16666586658² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16666586595 and 16666586604.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 182518 + ... + 258158.

Almost surely, 2^16666586658 is an apocalyptic number.

16666586658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16666586658 is an abundant number, since it is smaller than the sum of its proper divisors (19447778538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16666586658 is a wasteful number, since it uses less digits than its factorization.

16666586658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87890 (or 87887 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 16666586658 in words is "sixteen billion, six hundred sixty-six million, five hundred eighty-six thousand, six hundred fifty-eight".