166256113 has 4 divisors (see below), whose sum is σ = 168533668. Its totient is φ = 163978560.

The previous prime is 166256063. The next prime is 166256117. The reversal of 166256113 is 311652661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 144288144 + 21967969 = 12012^2 + 4687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166256113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166256117) 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, 1138668 + ... + 1138813.

It is an arithmetic number, because the mean of its divisors is an integer number (42133417).

Almost surely, 2^166256113 is an apocalyptic number.

It is an amenable number.

166256113 is a deficient number, since it is larger than the sum of its proper divisors (2277555).

166256113 is an equidigital number, since it uses as much as digits as its factorization.

166256113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277554.

The product of its digits is 6480, while the sum is 31.

The square root of 166256113 is about 12894.0340080209. The cubic root of 166256113 is about 549.8689638247.

It can be divided in two parts, 1662 and 56113, that added together give a palindrome (57775).

The spelling of 166256113 in words is "one hundred sixty-six million, two hundred fifty-six thousand, one hundred thirteen".