166844261 has 4 divisors (see below), whose sum is σ = 166876224. Its totient is φ = 166812300.

The previous prime is 166844213. The next prime is 166844281. The reversal of 166844261 is 162448661.

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: 162448661 = 1117 ⋅145433.

It is a cyclic number.

It is not a de Polignac number, because 166844261 - 2¹⁴ = 166827877 is a prime.

It is a super-3 number, since 3×166844261³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166844281) 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, 6125 + ... + 19266.

It is an arithmetic number, because the mean of its divisors is an integer number (41719056).

Almost surely, 2^166844261 is an apocalyptic number.

It is an amenable number.

166844261 is a deficient number, since it is larger than the sum of its proper divisors (31963).

166844261 is an equidigital number, since it uses as much as digits as its factorization.

166844261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31962.

The product of its digits is 55296, while the sum is 38.

The square root of 166844261 is about 12916.8208549937. The cubic root of 166844261 is about 550.5166066184.

The spelling of 166844261 in words is "one hundred sixty-six million, eight hundred forty-four thousand, two hundred sixty-one".