66864490943 has 2 divisors, whose sum is σ = 66864490944. Its totient is φ = 66864490942.

The previous prime is 66864490909. The next prime is 66864490951. The reversal of 66864490943 is 34909446866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66864490943 - 2⁶ = 66864490879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66864490843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33432245471 + 33432245472.

It is an arithmetic number, because the mean of its divisors is an integer number (33432245472).

Almost surely, 2^66864490943 is an apocalyptic number.

66864490943 is a deficient number, since it is larger than the sum of its proper divisors (1).

66864490943 is an equidigital number, since it uses as much as digits as its factorization.

66864490943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 59.

The spelling of 66864490943 in words is "sixty-six billion, eight hundred sixty-four million, four hundred ninety thousand, nine hundred forty-three".