66662291 has 2 divisors, whose sum is σ = 66662292. Its totient is φ = 66662290.

The previous prime is 66662261. The next prime is 66662293. The reversal of 66662291 is 19226666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66662291 is a prime.

It is a super-2 number, since 2×66662291² = 8887722082737362, which contains 22 as substring.

Together with 66662293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66662293) 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, 33331145 + 33331146.

It is an arithmetic number, because the mean of its divisors is an integer number (33331146).

Almost surely, 2^66662291 is an apocalyptic number.

66662291 is a deficient number, since it is larger than the sum of its proper divisors (1).

66662291 is an equidigital number, since it uses as much as digits as its factorization.

66662291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 66662291 is about 8164.6978511149. The cubic root of 66662291 is about 405.4712616146.

The spelling of 66662291 in words is "sixty-six million, six hundred sixty-two thousand, two hundred ninety-one".