66998063813 has 2 divisors, whose sum is σ = 66998063814. Its totient is φ = 66998063812.

The previous prime is 66998063791. The next prime is 66998063857. The reversal of 66998063813 is 31836089966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66994521889 + 3541924 = 258833^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 66998063813 - 2³⁰ = 65924321989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66998063893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33499031906 + 33499031907.

It is an arithmetic number, because the mean of its divisors is an integer number (33499031907).

Almost surely, 2^66998063813 is an apocalyptic number.

It is an amenable number.

66998063813 is a deficient number, since it is larger than the sum of its proper divisors (1).

66998063813 is an equidigital number, since it uses as much as digits as its factorization.

66998063813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 66998063813 in words is "sixty-six billion, nine hundred ninety-eight million, sixty-three thousand, eight hundred thirteen".