66358673 has 2 divisors, whose sum is σ = 66358674. Its totient is φ = 66358672.

The previous prime is 66358661. The next prime is 66358687. The reversal of 66358673 is 37685366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57638464 + 8720209 = 7592^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 66358673 - 2¹⁰ = 66357649 is a prime.

It is not a weakly prime, because it can be changed into another prime (66358613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33179336 + 33179337.

It is an arithmetic number, because the mean of its divisors is an integer number (33179337).

Almost surely, 2^66358673 is an apocalyptic number.

It is an amenable number.

66358673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66358673 is an equidigital number, since it uses as much as digits as its factorization.

66358673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 44.

The square root of 66358673 is about 8146.0832919876. The cubic root of 66358673 is about 404.8547424007.

The spelling of 66358673 in words is "sixty-six million, three hundred fifty-eight thousand, six hundred seventy-three".