118185578165 has 16 divisors (see below), whose sum is σ = 142284488112. Its totient is φ = 94240763904.

The previous prime is 118185578123. The next prime is 118185578167. The reversal of 118185578165 is 561875581811.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2785411729 + 115400166436 = 52777^2 + 339706^2 .

It is a cyclic number.

It is not a de Polignac number, because 118185578165 - 2¹⁶ = 118185512629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118185578165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118185578167) 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 15 ways as a sum of consecutive naturals, for example, 7502177 + ... + 7517913.

It is an arithmetic number, because the mean of its divisors is an integer number (8892780507).

Almost surely, 2^118185578165 is an apocalyptic number.

It is an amenable number.

118185578165 is a deficient number, since it is larger than the sum of its proper divisors (24098909947).

118185578165 is a wasteful number, since it uses less digits than its factorization.

118185578165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20536.

The product of its digits is 2688000, while the sum is 56.

The spelling of 118185578165 in words is "one hundred eighteen billion, one hundred eighty-five million, five hundred seventy-eight thousand, one hundred sixty-five".