165644153 has 8 divisors (see below), whose sum is σ = 170300040. Its totient is φ = 160997760.

The previous prime is 165644123. The next prime is 165644159. The reversal of 165644153 is 351446561.

It can be written as a sum of positive squares in 4 ways, for example, as 141800464 + 23843689 = 11908^2 + 4883^2 .

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 165644153 - 2⁸ = 165643897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165644159) 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, 47183 + ... + 50571.

It is an arithmetic number, because the mean of its divisors is an integer number (21287505).

Almost surely, 2^165644153 is an apocalyptic number.

It is an amenable number.

165644153 is a deficient number, since it is larger than the sum of its proper divisors (4655887).

165644153 is a wasteful number, since it uses less digits than its factorization.

165644153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747.

The product of its digits is 43200, while the sum is 35.

The square root of 165644153 is about 12870.2817762472. The cubic root of 165644153 is about 549.1934768411.

The spelling of 165644153 in words is "one hundred sixty-five million, six hundred forty-four thousand, one hundred fifty-three".