166522161 has 16 divisors (see below), whose sum is σ = 239347584. Its totient is φ = 102372864.

The previous prime is 166522141. The next prime is 166522171. The reversal of 166522161 is 161225661.

It is not a de Polignac number, because 166522161 - 2¹¹ = 166520113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166522141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61345 + ... + 64001.

It is an arithmetic number, because the mean of its divisors is an integer number (14959224).

Almost surely, 2^166522161 is an apocalyptic number.

It is an amenable number.

166522161 is a deficient number, since it is larger than the sum of its proper divisors (72825423).

166522161 is a wasteful number, since it uses less digits than its factorization.

166522161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280.

The product of its digits is 4320, while the sum is 30.

The square root of 166522161 is about 12904.3465932995. The cubic root of 166522161 is about 550.1621130938.

The spelling of 166522161 in words is "one hundred sixty-six million, five hundred twenty-two thousand, one hundred sixty-one".