165606043 has 4 divisors (see below), whose sum is σ = 170081920. Its totient is φ = 161130168.

The previous prime is 165606019. The next prime is 165606047. The reversal of 165606043 is 340606561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165606043 - 2¹³ = 165597851 is a prime.

It is a super-2 number, since 2×165606043² = 54850722956235698, 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 = 165605996 and 165606014.

It is not an unprimeable number, because it can be changed into a prime (165606047) 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, 2237883 + ... + 2237956.

It is an arithmetic number, because the mean of its divisors is an integer number (42520480).

Almost surely, 2^165606043 is an apocalyptic number.

165606043 is a deficient number, since it is larger than the sum of its proper divisors (4475877).

165606043 is an equidigital number, since it uses as much as digits as its factorization.

165606043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4475876.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 165606043 is about 12868.8011485142. The cubic root of 165606043 is about 549.1513556869.

The spelling of 165606043 in words is "one hundred sixty-five million, six hundred six thousand, forty-three".