165563434665 has 24 divisors (see below), whose sum is σ = 287164183488. Its totient is φ = 88242786720.

The previous prime is 165563434609. The next prime is 165563434693. The reversal of 165563434665 is 566434365561.

165563434665 is a `hidden beast` number, since 1 + 6 + 556 + 3 + 43 + 46 + 6 + 5 = 666.

It is not a de Polignac number, because 165563434665 - 2⁸ = 165563434409 is a prime.

It is a super-2 number, since 2×165563434665² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1132669 + ... + 1270458.

It is an arithmetic number, because the mean of its divisors is an integer number (11965174312).

Almost surely, 2^165563434665 is an apocalyptic number.

165563434665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165563434665 is a deficient number, since it is larger than the sum of its proper divisors (121600748823).

165563434665 is a wasteful number, since it uses less digits than its factorization.

165563434665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404669 (or 2404666 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 54.

The spelling of 165563434665 in words is "one hundred sixty-five billion, five hundred sixty-three million, four hundred thirty-four thousand, six hundred sixty-five".