165752785585 has 4 divisors (see below), whose sum is σ = 198903342708. Its totient is φ = 132602228464.

The previous prime is 165752785567. The next prime is 165752785621. The reversal of 165752785585 is 585587257561.

It is a happy number.

165752785585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86480693776 + 79272091809 = 294076^2 + 281553^2 .

It is a cyclic number.

It is not a de Polignac number, because 165752785585 - 2⁵ = 165752785553 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 16575278554 + ... + 16575278563.

It is an arithmetic number, because the mean of its divisors is an integer number (49725835677).

Almost surely, 2^165752785585 is an apocalyptic number.

It is an amenable number.

165752785585 is a deficient number, since it is larger than the sum of its proper divisors (33150557123).

165752785585 is an equidigital number, since it uses as much as digits as its factorization.

165752785585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33150557122.

The product of its digits is 117600000, while the sum is 64.

The spelling of 165752785585 in words is "one hundred sixty-five billion, seven hundred fifty-two million, seven hundred eighty-five thousand, five hundred eighty-five".