66106231 has 2 divisors, whose sum is σ = 66106232. Its totient is φ = 66106230.

The previous prime is 66106213. The next prime is 66106237. The reversal of 66106231 is 13260166.

Together with previous prime (66106213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66106231 - 2⁹ = 66105719 is a prime.

It is a super-2 number, since 2×66106231² = 8740067554050722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66106196 and 66106205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66106237) 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, 33053115 + 33053116.

It is an arithmetic number, because the mean of its divisors is an integer number (33053116).

Almost surely, 2^66106231 is an apocalyptic number.

66106231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66106231 is an equidigital number, since it uses as much as digits as its factorization.

66106231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 66106231 is about 8130.5738419868. The cubic root of 66106231 is about 404.3407065287.

Adding to 66106231 its reverse (13260166), we get a palindrome (79366397).

The spelling of 66106231 in words is "sixty-six million, one hundred six thousand, two hundred thirty-one".