66055643 has 2 divisors, whose sum is σ = 66055644. Its totient is φ = 66055642.

The previous prime is 66055607. The next prime is 66055663. The reversal of 66055643 is 34655066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66055643 - 2¹⁰ = 66054619 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66055603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33027821 + 33027822.

It is an arithmetic number, because the mean of its divisors is an integer number (33027822).

Almost surely, 2^66055643 is an apocalyptic number.

66055643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66055643 is an equidigital number, since it uses as much as digits as its factorization.

66055643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 66055643 is about 8127.4622730592. The cubic root of 66055643 is about 404.2375392111.

The spelling of 66055643 in words is "sixty-six million, fifty-five thousand, six hundred forty-three".