165605143 has 8 divisors (see below), whose sum is σ = 191287440. Its totient is φ = 141694080.

The previous prime is 165605123. The next prime is 165605147. The reversal of 165605143 is 341506561.

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

It is a de Polignac number, because none of the positive numbers 2^k-165605143 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 (165605147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442608 + ... + 442981.

It is an arithmetic number, because the mean of its divisors is an integer number (23910930).

Almost surely, 2^165605143 is an apocalyptic number.

165605143 is a deficient number, since it is larger than the sum of its proper divisors (25682297).

165605143 is a wasteful number, since it uses less digits than its factorization.

165605143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885617.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 165605143 is about 12868.7661801744. The cubic root of 165605143 is about 549.1503608820.

The spelling of 165605143 in words is "one hundred sixty-five million, six hundred five thousand, one hundred forty-three".