166258139 has 2 divisors, whose sum is σ = 166258140. Its totient is φ = 166258138.

The previous prime is 166258111. The next prime is 166258163. The reversal of 166258139 is 931852661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166258139 - 2¹² = 166254043 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 166258096 and 166258105.

It is not a weakly prime, because it can be changed into another prime (166258109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83129069 + 83129070.

It is an arithmetic number, because the mean of its divisors is an integer number (83129070).

Almost surely, 2^166258139 is an apocalyptic number.

166258139 is a deficient number, since it is larger than the sum of its proper divisors (1).

166258139 is an equidigital number, since it uses as much as digits as its factorization.

166258139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 166258139 is about 12894.1125712474. The cubic root of 166258139 is about 549.8711973867.

The spelling of 166258139 in words is "one hundred sixty-six million, two hundred fifty-eight thousand, one hundred thirty-nine".