165616647 has 16 divisors (see below), whose sum is σ = 256507392. Its totient is φ = 93085920.

The previous prime is 165616621. The next prime is 165616667. The reversal of 165616647 is 746616561.

It is a happy number.

It is not a de Polignac number, because 165616647 - 2¹⁰ = 165615623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165616599 and 165616608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165616667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63363 + ... + 65924.

It is an arithmetic number, because the mean of its divisors is an integer number (16031712).

Almost surely, 2^165616647 is an apocalyptic number.

165616647 is a deficient number, since it is larger than the sum of its proper divisors (90890745).

165616647 is a wasteful number, since it uses less digits than its factorization.

165616647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129358.

The product of its digits is 181440, while the sum is 42.

The square root of 165616647 is about 12869.2131461096. The cubic root of 165616647 is about 549.1630764281.

The spelling of 165616647 in words is "one hundred sixty-five million, six hundred sixteen thousand, six hundred forty-seven".