165632543 has 4 divisors (see below), whose sum is σ = 171344040. Its totient is φ = 159921048.

The previous prime is 165632527. The next prime is 165632573. The reversal of 165632543 is 345236561.

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 165632543 - 2⁴ = 165632527 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165632503) 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, 2855705 + ... + 2855762.

It is an arithmetic number, because the mean of its divisors is an integer number (42836010).

Almost surely, 2^165632543 is an apocalyptic number.

165632543 is a deficient number, since it is larger than the sum of its proper divisors (5711497).

165632543 is an equidigital number, since it uses as much as digits as its factorization.

165632543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5711496.

The product of its digits is 64800, while the sum is 35.

The square root of 165632543 is about 12869.8307292676. The cubic root of 165632543 is about 549.1806455496.

The spelling of 165632543 in words is "one hundred sixty-five million, six hundred thirty-two thousand, five hundred forty-three".