166115123 has 4 divisors (see below), whose sum is σ = 166172088. Its totient is φ = 166058160.

The previous prime is 166115107. The next prime is 166115137. The reversal of 166115123 is 321511661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321511661 = 29 ⋅11086609.

It is a cyclic number.

It is not a de Polignac number, because 166115123 - 2⁴ = 166115107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166115092 and 166115101.

It is not an unprimeable number, because it can be changed into a prime (166115023) 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, 23858 + ... + 30023.

It is an arithmetic number, because the mean of its divisors is an integer number (41543022).

Almost surely, 2^166115123 is an apocalyptic number.

166115123 is a deficient number, since it is larger than the sum of its proper divisors (56965).

166115123 is an equidigital number, since it uses as much as digits as its factorization.

166115123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56964.

The product of its digits is 1080, while the sum is 26.

The square root of 166115123 is about 12888.5655912518. The cubic root of 166115123 is about 549.7134849295.

Adding to 166115123 its reverse (321511661), we get a palindrome (487626784).

The spelling of 166115123 in words is "one hundred sixty-six million, one hundred fifteen thousand, one hundred twenty-three".