165641111 has 8 divisors (see below), whose sum is σ = 168404448. Its totient is φ = 162900000.

The previous prime is 165641093. The next prime is 165641129. The reversal of 165641111 is 111146561.

It is an interprime number because it is at equal distance from previous prime (165641093) and next prime (165641129).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165641111 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 (165641171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9821 + ... + 20681.

It is an arithmetic number, because the mean of its divisors is an integer number (21050556).

Almost surely, 2^165641111 is an apocalyptic number.

165641111 is a deficient number, since it is larger than the sum of its proper divisors (2763337).

165641111 is a wasteful number, since it uses less digits than its factorization.

165641111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11113.

The product of its digits is 720, while the sum is 26.

The square root of 165641111 is about 12870.1635964738. The cubic root of 165641111 is about 549.1901149017.

Adding to 165641111 its reverse (111146561), we get a palindrome (276787672).

The spelling of 165641111 in words is "one hundred sixty-five million, six hundred forty-one thousand, one hundred eleven".