165853866418 has 16 divisors (see below), whose sum is σ = 257369221080. Its totient is φ = 80064343296.

The previous prime is 165853866407. The next prime is 165853866463. The reversal of 165853866418 is 814668358561.

165853866418 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 4 ways, for example, as 104524829809 + 61329036609 = 323303^2 + 247647^2 .

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 7 ways as a sum of consecutive naturals, for example, 2571946 + ... + 2635642.

Almost surely, 2^165853866418 is an apocalyptic number.

165853866418 is a deficient number, since it is larger than the sum of its proper divisors (91515354662).

165853866418 is a wasteful number, since it uses less digits than its factorization.

165853866418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108621.

The product of its digits is 33177600, while the sum is 61.

The spelling of 165853866418 in words is "one hundred sixty-five billion, eight hundred fifty-three million, eight hundred sixty-six thousand, four hundred eighteen".