66455231 has 2 divisors, whose sum is σ = 66455232. Its totient is φ = 66455230.

The previous prime is 66455197. The next prime is 66455237. The reversal of 66455231 is 13255466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66455231 - 2¹⁴ = 66438847 is a prime.

It is a super-2 number, since 2×66455231² = 8832595454526722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66455237) 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, 33227615 + 33227616.

It is an arithmetic number, because the mean of its divisors is an integer number (33227616).

Almost surely, 2^66455231 is an apocalyptic number.

66455231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66455231 is an equidigital number, since it uses as much as digits as its factorization.

66455231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 66455231 is about 8152.0077894958. The cubic root of 66455231 is about 405.0510142517.

The spelling of 66455231 in words is "sixty-six million, four hundred fifty-five thousand, two hundred thirty-one".