166605116565 has 32 divisors (see below), whose sum is σ = 271137513600. Its totient is φ = 87333523200.

The previous prime is 166605116549. The next prime is 166605116567. The reversal of 166605116565 is 565611506661.

It is not a de Polignac number, because 166605116565 - 2⁴ = 166605116549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166605116567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5710515 + ... + 5739615.

It is an arithmetic number, because the mean of its divisors is an integer number (8473047300).

Almost surely, 2^166605116565 is an apocalyptic number.

166605116565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166605116565 is a deficient number, since it is larger than the sum of its proper divisors (104532397035).

166605116565 is a wasteful number, since it uses less digits than its factorization.

166605116565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35637.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 166605116565 in words is "one hundred sixty-six billion, six hundred five million, one hundred sixteen thousand, five hundred sixty-five".