66631319 has 2 divisors, whose sum is σ = 66631320. Its totient is φ = 66631318.

The previous prime is 66631297. The next prime is 66631343. The reversal of 66631319 is 91313666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66631319 is a prime.

It is a super-2 number, since 2×66631319² = 8879465343359522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66631379) 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, 33315659 + 33315660.

It is an arithmetic number, because the mean of its divisors is an integer number (33315660).

Almost surely, 2^66631319 is an apocalyptic number.

66631319 is a deficient number, since it is larger than the sum of its proper divisors (1).

66631319 is an equidigital number, since it uses as much as digits as its factorization.

66631319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 35.

The square root of 66631319 is about 8162.8009286029. The cubic root of 66631319 is about 405.4084564858.

The spelling of 66631319 in words is "sixty-six million, six hundred thirty-one thousand, three hundred nineteen".