66678573329 has 4 divisors (see below), whose sum is σ = 67673775984. Its totient is φ = 65683370676.

The previous prime is 66678573319. The next prime is 66678573331. The reversal of 66678573329 is 92337587666.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92337587666 = 2 ⋅46168793833.

It is a cyclic number.

It is not a de Polignac number, because 66678573329 - 2¹² = 66678569233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66678573319) 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, 497601227 + ... + 497601360.

It is an arithmetic number, because the mean of its divisors is an integer number (16918443996).

Almost surely, 2^66678573329 is an apocalyptic number.

It is an amenable number.

66678573329 is a deficient number, since it is larger than the sum of its proper divisors (995202655).

66678573329 is an equidigital number, since it uses as much as digits as its factorization.

66678573329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995202654.

The product of its digits is 68584320, while the sum is 62.

The spelling of 66678573329 in words is "sixty-six billion, six hundred seventy-eight million, five hundred seventy-three thousand, three hundred twenty-nine".