66725708666 has 8 divisors (see below), whose sum is σ = 100090326240. Its totient is φ = 33362266588.

The previous prime is 66725708629. The next prime is 66725708671. The reversal of 66725708666 is 66680752766.

66725708666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134726 + ... + 389361.

It is an arithmetic number, because the mean of its divisors is an integer number (12511290780).

Almost surely, 2^66725708666 is an apocalyptic number.

66725708666 is a deficient number, since it is larger than the sum of its proper divisors (33364617574).

66725708666 is a wasteful number, since it uses less digits than its factorization.

66725708666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587748.

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 66725708666 in words is "sixty-six billion, seven hundred twenty-five million, seven hundred eight thousand, six hundred sixty-six".