66800862609 has 32 divisors (see below), whose sum is σ = 99835774080. Its totient is φ = 39447088128.

The previous prime is 66800862599. The next prime is 66800862631. The reversal of 66800862609 is 90626800866.

It is not a de Polignac number, because 66800862609 - 2⁴ = 66800862593 is a prime.

It is a super-3 number, since 3×66800862609³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66800862209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3177 + ... + 365529.

It is an arithmetic number, because the mean of its divisors is an integer number (3119867940).

Almost surely, 2^66800862609 is an apocalyptic number.

It is an amenable number.

66800862609 is a deficient number, since it is larger than the sum of its proper divisors (33034911471).

66800862609 is a wasteful number, since it uses less digits than its factorization.

66800862609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362561.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 66800862609 in words is "sixty-six billion, eight hundred million, eight hundred sixty-two thousand, six hundred nine".