66959333117809 has 12 divisors (see below), whose sum is σ = 73651289059908. Its totient is φ = 60829642058240.

The previous prime is 66959333117779. The next prime is 66959333117813. The reversal of 66959333117809 is 90871133395966.

It can be written as a sum of positive squares in 2 ways, for example, as 23242812366400 + 43716520751409 = 4821080^2 + 6611847^2 .

It is not a de Polignac number, because 66959333117809 - 2⁵ = 66959333117777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66959333117899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192912064 + ... + 193258849.

It is an arithmetic number, because the mean of its divisors is an integer number (6137607421659).

Almost surely, 2^{66959333117809} is an apocalyptic number.

It is an amenable number.

66959333117809 is a deficient number, since it is larger than the sum of its proper divisors (6691955942099).

66959333117809 is a wasteful number, since it uses less digits than its factorization.

66959333117809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386172368 (or 386172357 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 70.

The spelling of 66959333117809 in words is "sixty-six trillion, nine hundred fifty-nine billion, three hundred thirty-three million, one hundred seventeen thousand, eight hundred nine".