66897673 has 2 divisors, whose sum is σ = 66897674. Its totient is φ = 66897672.

The previous prime is 66897667. The next prime is 66897679. The reversal of 66897673 is 37679866.

It is a balanced prime because it is at equal distance from previous prime (66897667) and next prime (66897679).

It can be written as a sum of positive squares in only one way, i.e., 48818169 + 18079504 = 6987^2 + 4252^2 .

It is a cyclic number.

It is not a de Polignac number, because 66897673 - 2⁵ = 66897641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66897673.

It is not a weakly prime, because it can be changed into another prime (66897679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33448836 + 33448837.

It is an arithmetic number, because the mean of its divisors is an integer number (33448837).

Almost surely, 2^66897673 is an apocalyptic number.

It is an amenable number.

66897673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66897673 is an equidigital number, since it uses as much as digits as its factorization.

66897673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 52.

The square root of 66897673 is about 8179.0997670893. The cubic root of 66897673 is about 405.9479355208.

The spelling of 66897673 in words is "sixty-six million, eight hundred ninety-seven thousand, six hundred seventy-three".