66784012289 has 4 divisors (see below), whose sum is σ = 66859646256. Its totient is φ = 66708378324.

The previous prime is 66784012283. The next prime is 66784012291. The reversal of 66784012289 is 98221048766.

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 66784012289 - 2³² = 62489044993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66784012289.

It is not an unprimeable number, because it can be changed into a prime (66784012283) 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, 37815659 + ... + 37817424.

It is an arithmetic number, because the mean of its divisors is an integer number (16714911564).

Almost surely, 2^66784012289 is an apocalyptic number.

It is an amenable number.

66784012289 is a deficient number, since it is larger than the sum of its proper divisors (75633967).

66784012289 is an equidigital number, since it uses as much as digits as its factorization.

66784012289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75633966.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 66784012289 in words is "sixty-six billion, seven hundred eighty-four million, twelve thousand, two hundred eighty-nine".