165506501 has 8 divisors (see below), whose sum is σ = 168412800. Its totient is φ = 162620640.

The previous prime is 165506491. The next prime is 165506531. The reversal of 165506501 is 105605561.

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

It is a cyclic number.

It is not a de Polignac number, because 165506501 - 2¹⁸ = 165244357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165506531) 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, 11705 + ... + 21633.

It is an arithmetic number, because the mean of its divisors is an integer number (21051600).

Almost surely, 2^165506501 is an apocalyptic number.

It is an amenable number.

165506501 is a deficient number, since it is larger than the sum of its proper divisors (2906299).

165506501 is an equidigital number, since it uses as much as digits as its factorization.

165506501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10219.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 165506501 is about 12864.9329963277. The cubic root of 165506501 is about 549.0413061998.

The spelling of 165506501 in words is "one hundred sixty-five million, five hundred six thousand, five hundred one".