166654123 has 4 divisors (see below), whose sum is σ = 168662088. Its totient is φ = 164646160.

The previous prime is 166654091. The next prime is 166654129. The reversal of 166654123 is 321456661.

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 166654123 - 2⁵ = 166654091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166654129) 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, 1003858 + ... + 1004023.

It is an arithmetic number, because the mean of its divisors is an integer number (42165522).

Almost surely, 2^166654123 is an apocalyptic number.

166654123 is a deficient number, since it is larger than the sum of its proper divisors (2007965).

166654123 is an equidigital number, since it uses as much as digits as its factorization.

166654123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007964.

The product of its digits is 25920, while the sum is 34.

The square root of 166654123 is about 12909.4586640959. The cubic root of 166654123 is about 550.3074017111.

The spelling of 166654123 in words is "one hundred sixty-six million, six hundred fifty-four thousand, one hundred twenty-three".