165444027173 has 4 divisors (see below), whose sum is σ = 167050279968. Its totient is φ = 163837774380.

The previous prime is 165444027169. The next prime is 165444027191. The reversal of 165444027173 is 371720444561.

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.

It is a cyclic number.

It is not a de Polignac number, because 165444027173 - 2² = 165444027169 is a prime.

It is a super-2 number, since 2×165444027173² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165444027103) 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, 803126243 + ... + 803126448.

It is an arithmetic number, because the mean of its divisors is an integer number (41762569992).

Almost surely, 2^165444027173 is an apocalyptic number.

It is an amenable number.

165444027173 is a deficient number, since it is larger than the sum of its proper divisors (1606252795).

165444027173 is a wasteful number, since it uses less digits than its factorization.

165444027173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606252794.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 165444027173 in words is "one hundred sixty-five billion, four hundred forty-four million, twenty-seven thousand, one hundred seventy-three".