66706891066 has 8 divisors (see below), whose sum is σ = 100086331104. Its totient is φ = 33344780700.

The previous prime is 66706891037. The next prime is 66706891091. The reversal of 66706891066 is 66019860766.

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

It is a junction number, because it is equal to n+sod(n) for n = 66706890998 and 66706891016.

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, 4322790 + ... + 4338193.

It is an arithmetic number, because the mean of its divisors is an integer number (12510791388).

Almost surely, 2^66706891066 is an apocalyptic number.

66706891066 is a deficient number, since it is larger than the sum of its proper divisors (33379440038).

66706891066 is a wasteful number, since it uses less digits than its factorization.

66706891066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8664836.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 66706891066 in words is "sixty-six billion, seven hundred six million, eight hundred ninety-one thousand, sixty-six".