165532243 has 4 divisors (see below), whose sum is σ = 166316968. Its totient is φ = 164747520.

The previous prime is 165532207. The next prime is 165532253. The reversal of 165532243 is 342235561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342235561 = 23 ⋅14879807.

It is a cyclic number.

It is not a de Polignac number, because 165532243 - 2²¹ = 163435091 is a prime.

It is a super-2 number, since 2×165532243² = 54801846945222098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165532253) 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, 392046 + ... + 392467.

It is an arithmetic number, because the mean of its divisors is an integer number (41579242).

Almost surely, 2^165532243 is an apocalyptic number.

165532243 is a deficient number, since it is larger than the sum of its proper divisors (784725).

165532243 is an equidigital number, since it uses as much as digits as its factorization.

165532243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784724.

The product of its digits is 21600, while the sum is 31.

The square root of 165532243 is about 12865.9334290210. The cubic root of 165532243 is about 549.0697697114.

The spelling of 165532243 in words is "one hundred sixty-five million, five hundred thirty-two thousand, two hundred forty-three".