66064643 has 2 divisors, whose sum is σ = 66064644. Its totient is φ = 66064642.

The previous prime is 66064591. The next prime is 66064673. The reversal of 66064643 is 34646066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66064643 - 2²² = 61870339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66064673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33032321 + 33032322.

It is an arithmetic number, because the mean of its divisors is an integer number (33032322).

Almost surely, 2^66064643 is an apocalyptic number.

66064643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66064643 is an equidigital number, since it uses as much as digits as its factorization.

66064643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 66064643 is about 8128.0159325631. The cubic root of 66064643 is about 404.2558973330.

The spelling of 66064643 in words is "sixty-six million, sixty-four thousand, six hundred forty-three".