166112121 has 16 divisors (see below), whose sum is σ = 253931904. Its totient is φ = 94617984.

The previous prime is 166112113. The next prime is 166112137. The reversal of 166112121 is 121211661.

It is not a de Polignac number, because 166112121 - 2³ = 166112113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (166112101) 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 15 ways as a sum of consecutive naturals, for example, 5820 + ... + 19133.

It is an arithmetic number, because the mean of its divisors is an integer number (15870744).

Almost surely, 2^166112121 is an apocalyptic number.

It is an amenable number.

166112121 is a deficient number, since it is larger than the sum of its proper divisors (87819783).

166112121 is a wasteful number, since it uses less digits than its factorization.

166112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25280.

The product of its digits is 144, while the sum is 21.

The square root of 166112121 is about 12888.4491309079. The cubic root of 166112121 is about 549.7101734714.

Adding to 166112121 its reverse (121211661), we get a palindrome (287323782).

The spelling of 166112121 in words is "one hundred sixty-six million, one hundred twelve thousand, one hundred twenty-one".