66350689991 has 2 divisors, whose sum is σ = 66350689992. Its totient is φ = 66350689990.

The previous prime is 66350689981. The next prime is 66350690093. The reversal of 66350689991 is 19998605366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66350689991 - 2¹⁴ = 66350673607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66350689981) 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, 33175344995 + 33175344996.

It is an arithmetic number, because the mean of its divisors is an integer number (33175344996).

Almost surely, 2^66350689991 is an apocalyptic number.

66350689991 is a deficient number, since it is larger than the sum of its proper divisors (1).

66350689991 is an equidigital number, since it uses as much as digits as its factorization.

66350689991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18895680, while the sum is 62.

The spelling of 66350689991 in words is "sixty-six billion, three hundred fifty million, six hundred eighty-nine thousand, nine hundred ninety-one".