166771121 has 4 divisors (see below), whose sum is σ = 181932144. Its totient is φ = 151610100.

The previous prime is 166771097. The next prime is 166771217. The reversal of 166771121 is 121177661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166771121 - 2⁶ = 166771057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166771021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7580495 + ... + 7580516.

It is an arithmetic number, because the mean of its divisors is an integer number (45483036).

Almost surely, 2^166771121 is an apocalyptic number.

166771121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166771121 is a deficient number, since it is larger than the sum of its proper divisors (15161023).

166771121 is a wasteful number, since it uses less digits than its factorization.

166771121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15161022.

The product of its digits is 3528, while the sum is 32.

The square root of 166771121 is about 12913.9893526362. The cubic root of 166771121 is about 550.4361510097.

The spelling of 166771121 in words is "one hundred sixty-six million, seven hundred seventy-one thousand, one hundred twenty-one".