166636427 has 2 divisors, whose sum is σ = 166636428. Its totient is φ = 166636426.

The previous prime is 166636417. The next prime is 166636433. The reversal of 166636427 is 724636661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166636427 - 2⁴ = 166636411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166636417) 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, 83318213 + 83318214.

It is an arithmetic number, because the mean of its divisors is an integer number (83318214).

Almost surely, 2^166636427 is an apocalyptic number.

166636427 is a deficient number, since it is larger than the sum of its proper divisors (1).

166636427 is an equidigital number, since it uses as much as digits as its factorization.

166636427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 41.

The square root of 166636427 is about 12908.7732569753. The cubic root of 166636427 is about 550.2879230762.

The spelling of 166636427 in words is "one hundred sixty-six million, six hundred thirty-six thousand, four hundred twenty-seven".