66358566739 has 2 divisors, whose sum is σ = 66358566740. Its totient is φ = 66358566738.

The previous prime is 66358566727. The next prime is 66358566761. The reversal of 66358566739 is 93766585366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66358566739 - 2⁹ = 66358566227 is a prime.

It is not a weakly prime, because it can be changed into another prime (66358566709) 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, 33179283369 + 33179283370.

It is an arithmetic number, because the mean of its divisors is an integer number (33179283370).

Almost surely, 2^66358566739 is an apocalyptic number.

66358566739 is a deficient number, since it is larger than the sum of its proper divisors (1).

66358566739 is an equidigital number, since it uses as much as digits as its factorization.

66358566739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146966400, while the sum is 64.

The spelling of 66358566739 in words is "sixty-six billion, three hundred fifty-eight million, five hundred sixty-six thousand, seven hundred thirty-nine".