166261201 has 16 divisors (see below), whose sum is σ = 172476864. Its totient is φ = 160210944.

The previous prime is 166261171. The next prime is 166261211. The reversal of 166261201 is 102162661.

It is a cyclic number.

It is not a de Polignac number, because 166261201 - 2⁵ = 166261169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166261211) 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, 861361 + ... + 861553.

It is an arithmetic number, because the mean of its divisors is an integer number (10779804).

Almost surely, 2^166261201 is an apocalyptic number.

It is an amenable number.

166261201 is a deficient number, since it is larger than the sum of its proper divisors (6215663).

166261201 is a wasteful number, since it uses less digits than its factorization.

166261201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 166261201 is about 12894.2313070613. The cubic root of 166261201 is about 549.8745730516.

The spelling of 166261201 in words is "one hundred sixty-six million, two hundred sixty-one thousand, two hundred one".