66595643 has 2 divisors, whose sum is σ = 66595644. Its totient is φ = 66595642.

The previous prime is 66595619. The next prime is 66595651. The reversal of 66595643 is 34659566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66595643 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66595594 and 66595603.

It is not a weakly prime, because it can be changed into another prime (66595943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33297821 + 33297822.

It is an arithmetic number, because the mean of its divisors is an integer number (33297822).

Almost surely, 2^66595643 is an apocalyptic number.

66595643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66595643 is an equidigital number, since it uses as much as digits as its factorization.

66595643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 44.

The square root of 66595643 is about 8160.6153566995. The cubic root of 66595643 is about 405.3360884442.

The spelling of 66595643 in words is "sixty-six million, five hundred ninety-five thousand, six hundred forty-three".