66307331 has 2 divisors, whose sum is σ = 66307332. Its totient is φ = 66307330.

The previous prime is 66307313. The next prime is 66307363. The reversal of 66307331 is 13370366.

Together with previous prime (66307313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66307331 is a prime.

It is a super-2 number, since 2×66307331² = 8793324288687122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66307294 and 66307303.

It is not a weakly prime, because it can be changed into another prime (66307301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33153665 + 33153666.

It is an arithmetic number, because the mean of its divisors is an integer number (33153666).

Almost surely, 2^66307331 is an apocalyptic number.

66307331 is a deficient number, since it is larger than the sum of its proper divisors (1).

66307331 is an equidigital number, since it uses as much as digits as its factorization.

66307331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 29.

The square root of 66307331 is about 8142.9313517922. The cubic root of 66307331 is about 404.7503028236.

Adding to 66307331 its reverse (13370366), we get a palindrome (79677697).

The spelling of 66307331 in words is "sixty-six million, three hundred seven thousand, three hundred thirty-one".