66845399 has 2 divisors, whose sum is σ = 66845400. Its totient is φ = 66845398.

The previous prime is 66845369. The next prime is 66845453. The reversal of 66845399 is 99354866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66845399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66845369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33422699 + 33422700.

It is an arithmetic number, because the mean of its divisors is an integer number (33422700).

Almost surely, 2^66845399 is an apocalyptic number.

66845399 is a deficient number, since it is larger than the sum of its proper divisors (1).

66845399 is an equidigital number, since it uses as much as digits as its factorization.

66845399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 50.

The square root of 66845399 is about 8175.9035586289. The cubic root of 66845399 is about 405.8421717421.

The spelling of 66845399 in words is "sixty-six million, eight hundred forty-five thousand, three hundred ninety-nine".