165541215 has 16 divisors (see below), whose sum is σ = 302704128. Its totient is φ = 75675936.

The previous prime is 165541177. The next prime is 165541217. The reversal of 165541215 is 512145561.

It is not a de Polignac number, because 165541215 - 2¹¹ = 165539167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165541217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 788187 + ... + 788396.

It is an arithmetic number, because the mean of its divisors is an integer number (18919008).

Almost surely, 2^165541215 is an apocalyptic number.

165541215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165541215 is a deficient number, since it is larger than the sum of its proper divisors (137162913).

165541215 is a wasteful number, since it uses less digits than its factorization.

165541215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576598.

The product of its digits is 6000, while the sum is 30.

The square root of 165541215 is about 12866.2820970162. The cubic root of 165541215 is about 549.0796895612.

Adding to 165541215 its reverse (512145561), we get a palindrome (677686776).

The spelling of 165541215 in words is "one hundred sixty-five million, five hundred forty-one thousand, two hundred fifteen".