66531163 has 2 divisors, whose sum is σ = 66531164. Its totient is φ = 66531162.

The previous prime is 66531161. The next prime is 66531181. The reversal of 66531163 is 36113566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66531163 - 2¹ = 66531161 is a prime.

Together with 66531161, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66531161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33265581 + 33265582.

It is an arithmetic number, because the mean of its divisors is an integer number (33265582).

Almost surely, 2^66531163 is an apocalyptic number.

66531163 is a deficient number, since it is larger than the sum of its proper divisors (1).

66531163 is an equidigital number, since it uses as much as digits as its factorization.

66531163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 66531163 is about 8156.6637174766. The cubic root of 66531163 is about 405.2052264758.

The spelling of 66531163 in words is "sixty-six million, five hundred thirty-one thousand, one hundred sixty-three".