165565500015565 has 24 divisors (see below), whose sum is σ = 215174109413088. Its totient is φ = 122242767940800.

The previous prime is 165565500015541. The next prime is 165565500015611. The reversal of 165565500015565 is 565510005565561.

It is not a de Polignac number, because 165565500015565 - 2³¹ = 165563352531917 is a prime.

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 11888911 + ... + 21736540.

It is an arithmetic number, because the mean of its divisors is an integer number (8965587892212).

Almost surely, 2^{165565500015565} is an apocalyptic number.

It is an amenable number.

165565500015565 is a deficient number, since it is larger than the sum of its proper divisors (49608609397523).

165565500015565 is a wasteful number, since it uses less digits than its factorization.

165565500015565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33631309 (or 33631296 counting only the distinct ones).

The product of its (nonzero) digits is 16875000, while the sum is 55.

The spelling of 165565500015565 in words is "one hundred sixty-five trillion, five hundred sixty-five billion, five hundred million, fifteen thousand, five hundred sixty-five".