165531533 has 8 divisors (see below), whose sum is σ = 175384440. Its totient is φ = 155691520.

The previous prime is 165531523. The next prime is 165531539. The reversal of 165531533 is 335135561.

It can be written as a sum of positive squares in 4 ways, for example, as 13675204 + 151856329 = 3698^2 + 12323^2 .

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 165531533 - 2⁴ = 165531517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165531533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165531539) 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, 39503 + ... + 43491.

It is an arithmetic number, because the mean of its divisors is an integer number (21923055).

Almost surely, 2^165531533 is an apocalyptic number.

It is an amenable number.

165531533 is a deficient number, since it is larger than the sum of its proper divisors (9852907).

165531533 is a wasteful number, since it uses less digits than its factorization.

165531533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447.

The product of its digits is 20250, while the sum is 32.

The square root of 165531533 is about 12865.9058367454. The cubic root of 165531533 is about 549.0689846879.

The spelling of 165531533 in words is "one hundred sixty-five million, five hundred thirty-one thousand, five hundred thirty-three".