66864018803 has 2 divisors, whose sum is σ = 66864018804. Its totient is φ = 66864018802.

The previous prime is 66864018731. The next prime is 66864018841. The reversal of 66864018803 is 30881046866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66864018803 - 2⁸ = 66864018547 is a prime.

It is not a weakly prime, because it can be changed into another prime (66864018883) 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, 33432009401 + 33432009402.

It is an arithmetic number, because the mean of its divisors is an integer number (33432009402).

Almost surely, 2^66864018803 is an apocalyptic number.

66864018803 is a deficient number, since it is larger than the sum of its proper divisors (1).

66864018803 is an equidigital number, since it uses as much as digits as its factorization.

66864018803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 66864018803 in words is "sixty-six billion, eight hundred sixty-four million, eighteen thousand, eight hundred three".