66442690406779 has 2 divisors, whose sum is σ = 66442690406780. Its totient is φ = 66442690406778.

The previous prime is 66442690406773. The next prime is 66442690406821. The reversal of 66442690406779 is 97760409624466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66442690406779 - 2¹⁷ = 66442690275707 is a prime.

It is a super-2 number, since 2×66442690406779² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66442690406773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33221345203389 + 33221345203390.

It is an arithmetic number, because the mean of its divisors is an integer number (33221345203390).

Almost surely, 2^{66442690406779} is an apocalyptic number.

66442690406779 is a deficient number, since it is larger than the sum of its proper divisors (1).

66442690406779 is an equidigital number, since it uses as much as digits as its factorization.

66442690406779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658409472, while the sum is 70.

The spelling of 66442690406779 in words is "sixty-six trillion, four hundred forty-two billion, six hundred ninety million, four hundred six thousand, seven hundred seventy-nine".