165161515556 has 12 divisors (see below), whose sum is σ = 306034573068. Its totient is φ = 77723066112.

The previous prime is 165161515481. The next prime is 165161515661. The reversal of 165161515556 is 655515161561.

It can be written as a sum of positive squares in 2 ways, for example, as 121319856100 + 43841659456 = 348310^2 + 209384^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165161515556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1214422841 + ... + 1214422976.

It is an arithmetic number, because the mean of its divisors is an integer number (25502881089).

Almost surely, 2^165161515556 is an apocalyptic number.

It is an amenable number.

165161515556 is a deficient number, since it is larger than the sum of its proper divisors (140873057512).

165161515556 is a wasteful number, since it uses less digits than its factorization.

165161515556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428845838 (or 2428845836 counting only the distinct ones).

The product of its digits is 675000, while the sum is 47.

The spelling of 165161515556 in words is "one hundred sixty-five billion, one hundred sixty-one million, five hundred fifteen thousand, five hundred fifty-six".