166137187 has 2 divisors, whose sum is σ = 166137188. Its totient is φ = 166137186.

The previous prime is 166137157. The next prime is 166137203. The reversal of 166137187 is 781731661.

It is a strong prime.

It is an emirp because it is prime and its reverse (781731661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166137187 - 2¹¹ = 166135139 is a prime.

It is not a weakly prime, because it can be changed into another prime (166137157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83068593 + 83068594.

It is an arithmetic number, because the mean of its divisors is an integer number (83068594).

Almost surely, 2^166137187 is an apocalyptic number.

166137187 is a deficient number, since it is larger than the sum of its proper divisors (1).

166137187 is an equidigital number, since it uses as much as digits as its factorization.

166137187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 166137187 is about 12889.4215153357. The cubic root of 166137187 is about 549.7378221505.

The spelling of 166137187 in words is "one hundred sixty-six million, one hundred thirty-seven thousand, one hundred eighty-seven".