165511105 has 16 divisors (see below), whose sum is σ = 210351744. Its totient is φ = 124755840.

The previous prime is 165511081. The next prime is 165511123. The reversal of 165511105 is 501115561.

It is not a de Polignac number, because 165511105 - 2⁷ = 165510977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165511105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3036 + ... + 18445.

It is an arithmetic number, because the mean of its divisors is an integer number (13146984).

Almost surely, 2^165511105 is an apocalyptic number.

It is an amenable number.

165511105 is a deficient number, since it is larger than the sum of its proper divisors (44840639).

165511105 is a wasteful number, since it uses less digits than its factorization.

165511105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21576.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 165511105 is about 12865.1119311104. Note that the first 3 decimals coincide. The cubic root of 165511105 is about 549.0463971635.

Adding to 165511105 its reverse (501115561), we get a palindrome (666626666).

The spelling of 165511105 in words is "one hundred sixty-five million, five hundred eleven thousand, one hundred five".