66651230666 has 4 divisors (see below), whose sum is σ = 99976846002. Its totient is φ = 33325615332.

The previous prime is 66651230663. The next prime is 66651230831. The reversal of 66651230666 is 66603215666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65061215041 + 1590015625 = 255071^2 + 39875^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66651230666.

It is not an unprimeable number, because it can be changed into a prime (66651230663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16662807665 + ... + 16662807668.

Almost surely, 2^66651230666 is an apocalyptic number.

66651230666 is a deficient number, since it is larger than the sum of its proper divisors (33325615336).

66651230666 is a wasteful number, since it uses less digits than its factorization.

66651230666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33325615335.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 66651230666 in words is "sixty-six billion, six hundred fifty-one million, two hundred thirty thousand, six hundred sixty-six".