166947197 has 2 divisors, whose sum is σ = 166947198. Its totient is φ = 166947196.

The previous prime is 166947181. The next prime is 166947211. The reversal of 166947197 is 791749661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140517316 + 26429881 = 11854^2 + 5141^2 .

It is a cyclic number.

It is not a de Polignac number, because 166947197 - 2⁴ = 166947181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166947107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83473598 + 83473599.

It is an arithmetic number, because the mean of its divisors is an integer number (83473599).

Almost surely, 2^166947197 is an apocalyptic number.

It is an amenable number.

166947197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166947197 is an equidigital number, since it uses as much as digits as its factorization.

166947197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 166947197 is about 12920.8048123946. The cubic root of 166947197 is about 550.6297986597.

The spelling of 166947197 in words is "one hundred sixty-six million, nine hundred forty-seven thousand, one hundred ninety-seven".