166017121 has 16 divisors (see below), whose sum is σ = 182435328. Its totient is φ = 150393600.

The previous prime is 166017097. The next prime is 166017127. The reversal of 166017121 is 121710661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166017121 - 2²⁵ = 132462689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166017127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110451 + ... + 111943.

It is an arithmetic number, because the mean of its divisors is an integer number (11402208).

Almost surely, 2^166017121 is an apocalyptic number.

It is an amenable number.

166017121 is a deficient number, since it is larger than the sum of its proper divisors (16418207).

166017121 is a wasteful number, since it uses less digits than its factorization.

166017121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 166017121 is about 12884.7631332516. The cubic root of 166017121 is about 549.6053598778.

Adding to 166017121 its reverse (121710661), we get a palindrome (287727782).

It can be divided in two parts, 1660 and 17121, that added together give a palindrome (18781).

The spelling of 166017121 in words is "one hundred sixty-six million, seventeen thousand, one hundred twenty-one".