165641243 has 8 divisors (see below), whose sum is σ = 172957680. Its totient is φ = 158431840.

The previous prime is 165641237. The next prime is 165641293. The reversal of 165641243 is 342146561.

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

It is a cyclic number.

It is not a de Polignac number, because 165641243 - 2¹⁰ = 165640219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165641213) 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, 23588 + ... + 29793.

It is an arithmetic number, because the mean of its divisors is an integer number (21619710).

Almost surely, 2^165641243 is an apocalyptic number.

165641243 is a deficient number, since it is larger than the sum of its proper divisors (7316437).

165641243 is a wasteful number, since it uses less digits than its factorization.

165641243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53517.

The product of its digits is 17280, while the sum is 32.

The square root of 165641243 is about 12870.1687246127. The cubic root of 165641243 is about 549.1902607856.

The spelling of 165641243 in words is "one hundred sixty-five million, six hundred forty-one thousand, two hundred forty-three".