165120505 has 8 divisors (see below), whose sum is σ = 216157824. Its totient is φ = 120087600.

The previous prime is 165120499. The next prime is 165120509. The reversal of 165120505 is 505021561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165120505 - 2³ = 165120497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165120505.

It is not an unprimeable number, because it can be changed into a prime (165120509) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1501041 + ... + 1501150.

It is an arithmetic number, because the mean of its divisors is an integer number (27019728).

Almost surely, 2^165120505 is an apocalyptic number.

It is an amenable number.

165120505 is a deficient number, since it is larger than the sum of its proper divisors (51037319).

165120505 is a wasteful number, since it uses less digits than its factorization.

165120505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002207.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 165120505 is about 12849.9223733064. The cubic root of 165120505 is about 548.6141473190.

The spelling of 165120505 in words is "one hundred sixty-five million, one hundred twenty thousand, five hundred five".