165555123 has 8 divisors (see below), whose sum is σ = 220820736. Its totient is φ = 110329800.

The previous prime is 165555083. The next prime is 165555133. The reversal of 165555123 is 321555561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165555123 - 2¹² = 165551027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165555133) 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 7 ways as a sum of consecutive naturals, for example, 1378 + ... + 18248.

It is an arithmetic number, because the mean of its divisors is an integer number (27602592).

Almost surely, 2^165555123 is an apocalyptic number.

165555123 is a deficient number, since it is larger than the sum of its proper divisors (55265613).

165555123 is a wasteful number, since it uses less digits than its factorization.

165555123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20145.

The product of its digits is 22500, while the sum is 33.

The square root of 165555123 is about 12866.8225681401. The cubic root of 165555123 is about 549.0950661679.

The spelling of 165555123 in words is "one hundred sixty-five million, five hundred fifty-five thousand, one hundred twenty-three".