165606453 has 6 divisors (see below), whose sum is σ = 239209334. Its totient is φ = 110404296.

The previous prime is 165606383. The next prime is 165606473. The reversal of 165606453 is 354606561.

165606453 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 0 + 645 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 96000804 + 69605649 = 9798^2 + 8343^2 .

It is not a de Polignac number, because 165606453 - 2¹³ = 165598261 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 (165606473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9200350 + ... + 9200367.

Almost surely, 2^165606453 is an apocalyptic number.

It is an amenable number.

165606453 is a deficient number, since it is larger than the sum of its proper divisors (73602881).

165606453 is a wasteful number, since it uses less digits than its factorization.

165606453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18400723 (or 18400720 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 165606453 is about 12868.8170785041. The cubic root of 165606453 is about 549.1518088746.

The spelling of 165606453 in words is "one hundred sixty-five million, six hundred six thousand, four hundred fifty-three".