66661304170 has 8 divisors (see below), whose sum is σ = 119990347524. Its totient is φ = 26664521664.

The previous prime is 66661304137. The next prime is 66661304173. The reversal of 66661304170 is 7140316666.

It can be written as a sum of positive squares in 2 ways, for example, as 66500547129 + 160757041 = 257877^2 + 12679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66661304173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333065199 + ... + 3333065218.

Almost surely, 2^66661304170 is an apocalyptic number.

66661304170 is a deficient number, since it is larger than the sum of its proper divisors (53329043354).

66661304170 is a wasteful number, since it uses less digits than its factorization.

66661304170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666130424.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 66661304170 in words is "sixty-six billion, six hundred sixty-one million, three hundred four thousand, one hundred seventy".