166613197 has 2 divisors, whose sum is σ = 166613198. Its totient is φ = 166613196.

The previous prime is 166613177. The next prime is 166613201. The reversal of 166613197 is 791316661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164711556 + 1901641 = 12834^2 + 1379^2 .

It is an emirp because it is prime and its reverse (791316661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166613197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166613177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83306598 + 83306599.

It is an arithmetic number, because the mean of its divisors is an integer number (83306599).

Almost surely, 2^166613197 is an apocalyptic number.

It is an amenable number.

166613197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166613197 is an equidigital number, since it uses as much as digits as its factorization.

166613197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 166613197 is about 12907.8734499529. The cubic root of 166613197 is about 550.2623508714.

The spelling of 166613197 in words is "one hundred sixty-six million, six hundred thirteen thousand, one hundred ninety-seven".