165215145555525 has 96 divisors (see below), whose sum is σ = 295846149634560. Its totient is φ = 80872703297280.

The previous prime is 165215145555503. The next prime is 165215145555539. The reversal of 165215145555525 is 525555541512561.

It is a happy number.

It is not a de Polignac number, because 165215145555525 - 2¹¹ = 165215145553477 is a prime.

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 95 ways as a sum of consecutive naturals, for example, 1603309654 + ... + 1603412696.

It is an arithmetic number, because the mean of its divisors is an integer number (3081730725360).

Almost surely, 2^{165215145555525} is an apocalyptic number.

165215145555525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165215145555525 is a deficient number, since it is larger than the sum of its proper divisors (130631004079035).

165215145555525 is a wasteful number, since it uses less digits than its factorization.

165215145555525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112435 (or 112430 counting only the distinct ones).

The product of its digits is 37500000, while the sum is 57.

The spelling of 165215145555525 in words is "one hundred sixty-five trillion, two hundred fifteen billion, one hundred forty-five million, five hundred fifty-five thousand, five hundred twenty-five".