66813549059 has 2 divisors, whose sum is σ = 66813549060. Its totient is φ = 66813549058.

The previous prime is 66813549041. The next prime is 66813549079. The reversal of 66813549059 is 95094531866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66813549059 - 2⁸ = 66813548803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66813548995 and 66813549013.

It is not a weakly prime, because it can be changed into another prime (66813549079) 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, 33406774529 + 33406774530.

It is an arithmetic number, because the mean of its divisors is an integer number (33406774530).

Almost surely, 2^66813549059 is an apocalyptic number.

66813549059 is a deficient number, since it is larger than the sum of its proper divisors (1).

66813549059 is an equidigital number, since it uses as much as digits as its factorization.

66813549059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 66813549059 in words is "sixty-six billion, eight hundred thirteen million, five hundred forty-nine thousand, fifty-nine".