66695873 has 2 divisors, whose sum is σ = 66695874. Its totient is φ = 66695872.

The previous prime is 66695857. The next prime is 66695897. The reversal of 66695873 is 37859666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64529089 + 2166784 = 8033^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 66695873 - 2⁴ = 66695857 is a prime.

It is not a weakly prime, because it can be changed into another prime (66695803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33347936 + 33347937.

It is an arithmetic number, because the mean of its divisors is an integer number (33347937).

Almost surely, 2^66695873 is an apocalyptic number.

It is an amenable number.

66695873 is a deficient number, since it is larger than the sum of its proper divisors (1).

66695873 is an equidigital number, since it uses as much as digits as its factorization.

66695873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 50.

The square root of 66695873 is about 8166.7541287834. The cubic root of 66695873 is about 405.5393373330.

The spelling of 66695873 in words is "sixty-six million, six hundred ninety-five thousand, eight hundred seventy-three".