66077382209 has 4 divisors (see below), whose sum is σ = 68355912660. Its totient is φ = 63798851760.

The previous prime is 66077382199. The next prime is 66077382227. The reversal of 66077382209 is 90228377066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19236303025 + 46841079184 = 138695^2 + 216428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66077382209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66077384209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139265182 + ... + 1139265239.

It is an arithmetic number, because the mean of its divisors is an integer number (17088978165).

Almost surely, 2^66077382209 is an apocalyptic number.

It is an amenable number.

66077382209 is a deficient number, since it is larger than the sum of its proper divisors (2278530451).

66077382209 is a wasteful number, since it uses less digits than its factorization.

66077382209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278530450.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 66077382209 in words is "sixty-six billion, seventy-seven million, three hundred eighty-two thousand, two hundred nine".