165416123 has 4 divisors (see below), whose sum is σ = 166282368. Its totient is φ = 164549880.

The previous prime is 165416107. The next prime is 165416131. The reversal of 165416123 is 321614561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165416123 - 2⁴ = 165416107 is a prime.

It is a super-2 number, since 2×165416123² = 54724987496702258, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165416143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432836 + ... + 433217.

It is an arithmetic number, because the mean of its divisors is an integer number (41570592).

Almost surely, 2^165416123 is an apocalyptic number.

165416123 is a deficient number, since it is larger than the sum of its proper divisors (866245).

165416123 is an equidigital number, since it uses as much as digits as its factorization.

165416123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866244.

The product of its digits is 4320, while the sum is 29.

The square root of 165416123 is about 12861.4199449361. The cubic root of 165416123 is about 548.9413498239.

The spelling of 165416123 in words is "one hundred sixty-five million, four hundred sixteen thousand, one hundred twenty-three".