66666688888073 has 2 divisors, whose sum is σ = 66666688888074. Its totient is φ = 66666688888072.

The previous prime is 66666688888069. The next prime is 66666688888103. The reversal of 66666688888073 is 37088888666666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63220182036544 + 3446506851529 = 7951112^2 + 1856477^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666688888073 - 2² = 66666688888069 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666688888873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333344444036 + 33333344444037.

It is an arithmetic number, because the mean of its divisors is an integer number (33333344444037).

Almost surely, 2^{66666688888073} is an apocalyptic number.

It is an amenable number.

66666688888073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666688888073 is an equidigital number, since it uses as much as digits as its factorization.

66666688888073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32105299968, while the sum is 86.

The spelling of 66666688888073 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, seventy-three".