165500856693 has 20 divisors (see below), whose sum is σ = 247244815180. Its totient is φ = 110327147712.

The previous prime is 165500856691. The next prime is 165500856743. The reversal of 165500856693 is 396658005561.

It is a happy number.

165500856693 is a `hidden beast` number, since 1 + 6 + 550 + 0 + 85 + 6 + 6 + 9 + 3 = 666.

165500856693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 99213660324 + 66287196369 = 314982^2 + 257463^2 .

It is not a de Polignac number, because 165500856693 - 2¹ = 165500856691 is a prime.

It is a super-2 number, since 2×165500856693² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165500856691) 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 19 ways as a sum of consecutive naturals, for example, 1511121 + ... + 1616937.

It is an arithmetic number, because the mean of its divisors is an integer number (12362240759).

Almost surely, 2^165500856693 is an apocalyptic number.

It is an amenable number.

165500856693 is a deficient number, since it is larger than the sum of its proper divisors (81743958487).

165500856693 is a wasteful number, since it uses less digits than its factorization.

165500856693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125138 (or 125129 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 165500856693 in words is "one hundred sixty-five billion, five hundred million, eight hundred fifty-six thousand, six hundred ninety-three".