165051820878 has 32 divisors (see below), whose sum is σ = 377550077184. Its totient is φ = 47121566592.

The previous prime is 165051820861. The next prime is 165051820903. The reversal of 165051820878 is 878028150561.

It is a self number, because there is not a number n which added to its sum of digits gives 165051820878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1448475 + ... + 1558262.

It is an arithmetic number, because the mean of its divisors is an integer number (11798439912).

Almost surely, 2^165051820878 is an apocalyptic number.

165051820878 is an abundant number, since it is smaller than the sum of its proper divisors (212498256306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165051820878 is a wasteful number, since it uses less digits than its factorization.

165051820878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008056.

The product of its (nonzero) digits is 1075200, while the sum is 51.

The spelling of 165051820878 in words is "one hundred sixty-five billion, fifty-one million, eight hundred twenty thousand, eight hundred seventy-eight".