66718808073 has 24 divisors (see below), whose sum is σ = 104798391048. Its totient is φ = 40731351552.

The previous prime is 66718808053. The next prime is 66718808087. The reversal of 66718808073 is 37080881766.

It can be written as a sum of positive squares in 4 ways, for example, as 9141845769 + 57576962304 = 95613^2 + 239952^2 .

It is not a de Polignac number, because 66718808073 - 2²⁶ = 66651699209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66718808053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5887186 + ... + 5898507.

It is an arithmetic number, because the mean of its divisors is an integer number (4366599627).

Almost surely, 2^66718808073 is an apocalyptic number.

It is an amenable number.

66718808073 is a deficient number, since it is larger than the sum of its proper divisors (38079582975).

66718808073 is a wasteful number, since it uses less digits than its factorization.

66718808073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11785753 (or 11785750 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 66718808073 in words is "sixty-six billion, seven hundred eighteen million, eight hundred eight thousand, seventy-three".