165563543 has 4 divisors (see below), whose sum is σ = 167202888. Its totient is φ = 163924200.

The previous prime is 165563537. The next prime is 165563557. The reversal of 165563543 is 345365561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345365561 = 101 ⋅3419461.

It is a cyclic number.

It is not a de Polignac number, because 165563543 - 2¹⁴ = 165547159 is a prime.

It is a super-2 number, since 2×165563543² = 54822573541425698, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165563497 and 165563506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165563533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819521 + ... + 819722.

It is an arithmetic number, because the mean of its divisors is an integer number (41800722).

Almost surely, 2^165563543 is an apocalyptic number.

165563543 is a deficient number, since it is larger than the sum of its proper divisors (1639345).

165563543 is a wasteful number, since it uses less digits than its factorization.

165563543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639344.

The product of its digits is 162000, while the sum is 38.

The square root of 165563543 is about 12867.1497620880. The cubic root of 165563543 is about 549.1043748542.

The spelling of 165563543 in words is "one hundred sixty-five million, five hundred sixty-three thousand, five hundred forty-three".