166858161 has 16 divisors (see below), whose sum is σ = 225428160. Its totient is φ = 109771200.

The previous prime is 166858147. The next prime is 166858183. The reversal of 166858161 is 161858661.

166858161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166858161 - 2⁵ = 166858129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166858121) 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, 114111 + ... + 115563.

It is an arithmetic number, because the mean of its divisors is an integer number (14089260).

Almost surely, 2^166858161 is an apocalyptic number.

It is an amenable number.

166858161 is a deficient number, since it is larger than the sum of its proper divisors (58569999).

166858161 is a wasteful number, since it uses less digits than its factorization.

166858161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its digits is 69120, while the sum is 42.

The square root of 166858161 is about 12917.3589018808. The cubic root of 166858161 is about 550.5318942650.

The spelling of 166858161 in words is "one hundred sixty-six million, eight hundred fifty-eight thousand, one hundred sixty-one".