166913 has 4 divisors (see below), whose sum is σ = 169008. Its totient is φ = 164820.

The previous prime is 166909. The next prime is 166919. The reversal of 166913 is 319661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 319661 = 373 ⋅857.

It is a cyclic number.

It is not a de Polignac number, because 166913 - 2² = 166909 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (42252).

It is a Proth number, since it is equal to 163 ⋅ 2¹⁰ + 1 and 163 < 2¹⁰.

2¹⁶⁶⁹¹³ is an apocalyptic number.

It is an amenable number.

166913 is a deficient number, since it is larger than the sum of its proper divisors (2095).

166913 is an equidigital number, since it uses as much as digits as its factorization.

166913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094.

The product of its digits is 972, while the sum is 26.

The square root of 166913 is about 408.5498745563. The cubic root of 166913 is about 55.0592199600.

The spelling of 166913 in words is "one hundred sixty-six thousand, nine hundred thirteen".