66008020082809 has 4 divisors (see below), whose sum is σ = 75437737237504. Its totient is φ = 56578302928116.

The previous prime is 66008020082783. The next prime is 66008020082839. The reversal of 66008020082809 is 90828002080066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66008020082809 - 2⁷ = 66008020082681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66008020082839) 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, 4714858577337 + ... + 4714858577350.

It is an arithmetic number, because the mean of its divisors is an integer number (18859434309376).

Almost surely, 2^{66008020082809} is an apocalyptic number.

It is an amenable number.

66008020082809 is a deficient number, since it is larger than the sum of its proper divisors (9429717154695).

66008020082809 is an equidigital number, since it uses as much as digits as its factorization.

66008020082809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429717154694.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 66008020082809 in words is "sixty-six trillion, eight billion, twenty million, eighty-two thousand, eight hundred nine".