6651712066 has 16 divisors (see below), whose sum is σ = 10021163256. Its totient is φ = 3311352576.

The previous prime is 6651712061. The next prime is 6651712139. The reversal of 6651712066 is 6602171566.

It can be written as a sum of positive squares in 4 ways, for example, as 5814825025 + 836887041 = 76255^2 + 28929^2 .

It is not an unprimeable number, because it can be changed into a prime (6651712061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503700 + ... + 516736.

Almost surely, 2^6651712066 is an apocalyptic number.

6651712066 is a deficient number, since it is larger than the sum of its proper divisors (3369451190).

6651712066 is a wasteful number, since it uses less digits than its factorization.

6651712066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14133.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 6651712066 is about 81558.0288261064. The cubic root of 6651712066 is about 1880.6637223794.

The spelling of 6651712066 in words is "six billion, six hundred fifty-one million, seven hundred twelve thousand, sixty-six".