66718373 has 2 divisors, whose sum is σ = 66718374. Its totient is φ = 66718372.

The previous prime is 66718343. The next prime is 66718397. The reversal of 66718373 is 37381766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62125924 + 4592449 = 7882^2 + 2143^2 .

It is a cyclic number.

It is not a de Polignac number, because 66718373 - 2⁸ = 66718117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 66718373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66718313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33359186 + 33359187.

It is an arithmetic number, because the mean of its divisors is an integer number (33359187).

Almost surely, 2^66718373 is an apocalyptic number.

It is an amenable number.

66718373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66718373 is an equidigital number, since it uses as much as digits as its factorization.

66718373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 66718373 is about 8168.1315488917. The cubic root of 66718373 is about 405.5849354028.

The spelling of 66718373 in words is "sixty-six million, seven hundred eighteen thousand, three hundred seventy-three".