66646264666 has 8 divisors (see below), whose sum is σ = 99979523604. Its totient is φ = 33319756800.

The previous prime is 66646264651. The next prime is 66646264669.

66646264666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 43397639041 + 23248625625 = 208321^2 + 152475^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 66646264666.

It is not an unprimeable number, because it can be changed into a prime (66646264669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663015 + ... + 1702618.

Almost surely, 2^66646264666 is an apocalyptic number.

66646264666 is a deficient number, since it is larger than the sum of its proper divisors (33333258938).

66646264666 is a wasteful number, since it uses less digits than its factorization.

66646264666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375536.

The product of its digits is 53747712, while the sum is 58.

The spelling of 66646264666 in words is "sixty-six billion, six hundred forty-six million, two hundred sixty-four thousand, six hundred sixty-six".