66631343 has 2 divisors, whose sum is σ = 66631344. Its totient is φ = 66631342.

The previous prime is 66631319. The next prime is 66631379. The reversal of 66631343 is 34313666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66631343 - 2⁸ = 66631087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66631393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33315671 + 33315672.

It is an arithmetic number, because the mean of its divisors is an integer number (33315672).

Almost surely, 2^66631343 is an apocalyptic number.

66631343 is a deficient number, since it is larger than the sum of its proper divisors (1).

66631343 is an equidigital number, since it uses as much as digits as its factorization.

66631343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 32.

The square root of 66631343 is about 8162.8023986864. The cubic root of 66631343 is about 405.4085051606.

The spelling of 66631343 in words is "sixty-six million, six hundred thirty-one thousand, three hundred forty-three".