66684068345 has 8 divisors (see below), whose sum is σ = 80370319560. Its totient is φ = 53114296320.

The previous prime is 66684068323. The next prime is 66684068417. The reversal of 66684068345 is 54386048666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10993732201 + 55690336144 = 104851^2 + 235988^2 .

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

It is not a de Polignac number, because 66684068345 - 2⁶ = 66684068281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29118536 + ... + 29120825.

It is an arithmetic number, because the mean of its divisors is an integer number (10046289945).

Almost surely, 2^66684068345 is an apocalyptic number.

It is an amenable number.

66684068345 is a deficient number, since it is larger than the sum of its proper divisors (13686251215).

66684068345 is a wasteful number, since it uses less digits than its factorization.

66684068345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58239595.

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 66684068345 in words is "sixty-six billion, six hundred eighty-four million, sixty-eight thousand, three hundred forty-five".