166722205 has 8 divisors (see below), whose sum is σ = 215456472. Its totient is φ = 123117888.

The previous prime is 166722203. The next prime is 166722217. The reversal of 166722205 is 502227661.

It can be written as a sum of positive squares in 4 ways, for example, as 1779556 + 164942649 = 1334^2 + 12843^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 166722205 - 2¹ = 166722203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166722203) 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, 1282414 + ... + 1282543.

It is an arithmetic number, because the mean of its divisors is an integer number (26932059).

Almost surely, 2^166722205 is an apocalyptic number.

It is an amenable number.

166722205 is a deficient number, since it is larger than the sum of its proper divisors (48734267).

166722205 is a wasteful number, since it uses less digits than its factorization.

166722205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564975.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 166722205 is about 12912.0952985950. The cubic root of 166722205 is about 550.3823292059.

Adding to 166722205 its reverse (502227661), we get a palindrome (668949866).

The spelling of 166722205 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, two hundred five".