66301643 has 2 divisors, whose sum is σ = 66301644. Its totient is φ = 66301642.

The previous prime is 66301607. The next prime is 66301667. The reversal of 66301643 is 34610366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66301643 - 2⁶ = 66301579 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66301243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33150821 + 33150822.

It is an arithmetic number, because the mean of its divisors is an integer number (33150822).

Almost surely, 2^66301643 is an apocalyptic number.

66301643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66301643 is an equidigital number, since it uses as much as digits as its factorization.

66301643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 66301643 is about 8142.5820843268. The cubic root of 66301643 is about 404.7387290126.

The spelling of 66301643 in words is "sixty-six million, three hundred one thousand, six hundred forty-three".