165516653 has 4 divisors (see below), whose sum is σ = 168322080. Its totient is φ = 162711228.

The previous prime is 165516647. The next prime is 165516661. The reversal of 165516653 is 356615561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 356615561 = 103 ⋅3462287.

It is a cyclic number.

It is not a de Polignac number, because 165516653 - 2¹⁰ = 165515629 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 (165516643) 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 3 ways as a sum of consecutive naturals, for example, 1402625 + ... + 1402742.

It is an arithmetic number, because the mean of its divisors is an integer number (42080520).

Almost surely, 2^165516653 is an apocalyptic number.

It is an amenable number.

165516653 is a deficient number, since it is larger than the sum of its proper divisors (2805427).

165516653 is an equidigital number, since it uses as much as digits as its factorization.

165516653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805426.

The product of its digits is 81000, while the sum is 38.

The square root of 165516653 is about 12865.3275512130. The cubic root of 165516653 is about 549.0525318483.

The spelling of 165516653 in words is "one hundred sixty-five million, five hundred sixteen thousand, six hundred fifty-three".