166620201 has 8 divisors (see below), whose sum is σ = 242356704. Its totient is φ = 100981920.

The previous prime is 166620163. The next prime is 166620203. The reversal of 166620201 is 102026661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166620201 - 2⁶ = 166620137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166620203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2524516 + ... + 2524581.

It is an arithmetic number, because the mean of its divisors is an integer number (30294588).

Almost surely, 2^166620201 is an apocalyptic number.

166620201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166620201 is a deficient number, since it is larger than the sum of its proper divisors (75736503).

166620201 is a wasteful number, since it uses less digits than its factorization.

166620201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049111.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 166620201 is about 12908.1447543789. The cubic root of 166620201 is about 550.2700613120.

Adding to 166620201 its reverse (102026661), we get a palindrome (268646862).

The spelling of 166620201 in words is "one hundred sixty-six million, six hundred twenty thousand, two hundred one".