165556 has 6 divisors (see below), whose sum is σ = 289730. Its totient is φ = 82776.

The previous prime is 165553. The next prime is 165559. The reversal of 165556 is 655561.

It is an interprime number because it is at equal distance from previous prime (165553) and next prime (165559).

It can be written as a sum of positive squares in only one way, i.e., 152100 + 13456 = 390^2 + 116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20691 + ... + 20698.

2¹⁶⁵⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

165556 is a deficient number, since it is larger than the sum of its proper divisors (124174).

165556 is a wasteful number, since it uses less digits than its factorization.

165556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41393 (or 41391 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The square root of 165556 is about 406.8857333454. The cubic root of 165556 is about 54.9096035745.

It can be divided in two parts, 16555 and 6, that added together give a palindrome (16561).

The spelling of 165556 in words is "one hundred sixty-five thousand, five hundred fifty-six".