165611001 has 8 divisors (see below), whose sum is σ = 226782784. Its totient is φ = 107423280.

The previous prime is 165610993. The next prime is 165611027. The reversal of 165611001 is 100116561.

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

It is not a de Polignac number, because 165611001 - 2³ = 165610993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165611051) 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, 745885 + ... + 746106.

It is an arithmetic number, because the mean of its divisors is an integer number (28347848).

Almost surely, 2^165611001 is an apocalyptic number.

It is an amenable number.

165611001 is a deficient number, since it is larger than the sum of its proper divisors (61171783).

165611001 is a wasteful number, since it uses less digits than its factorization.

165611001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492031.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 165611001 is about 12868.9937835093. The cubic root of 165611001 is about 549.1568358920.

Adding to 165611001 its reverse (100116561), we get a palindrome (265727562).

It can be divided in two parts, 16561 and 1001, that multiplied together give a palindrome (16577561).

The spelling of 165611001 in words is "one hundred sixty-five million, six hundred eleven thousand, one".