166176221 has 2 divisors, whose sum is σ = 166176222. Its totient is φ = 166176220.

The previous prime is 166176217. The next prime is 166176259. The reversal of 166176221 is 122671661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163968025 + 2208196 = 12805^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 166176221 - 2² = 166176217 is a prime.

It is a super-2 number, since 2×166176221² = 55229072851681682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166176721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83088110 + 83088111.

It is an arithmetic number, because the mean of its divisors is an integer number (83088111).

Almost surely, 2^166176221 is an apocalyptic number.

It is an amenable number.

166176221 is a deficient number, since it is larger than the sum of its proper divisors (1).

166176221 is an equidigital number, since it uses as much as digits as its factorization.

166176221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 166176221 is about 12890.9356138335. The cubic root of 166176221 is about 549.7808724878.

The spelling of 166176221 in words is "one hundred sixty-six million, one hundred seventy-six thousand, two hundred twenty-one".