66630843506 has 4 divisors (see below), whose sum is σ = 99946265262. Its totient is φ = 33315421752.

The previous prime is 66630843463. The next prime is 66630843509. The reversal of 66630843506 is 60534803666.

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., 57763796281 + 8867047225 = 240341^2 + 94165^2 .

It is not an unprimeable number, because it can be changed into a prime (66630843509) 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 as a sum of consecutive naturals, namely, 16657710875 + ... + 16657710878.

Almost surely, 2^66630843506 is an apocalyptic number.

66630843506 is a deficient number, since it is larger than the sum of its proper divisors (33315421756).

66630843506 is a wasteful number, since it uses less digits than its factorization.

66630843506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33315421755.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 66630843506 in words is "sixty-six billion, six hundred thirty million, eight hundred forty-three thousand, five hundred six".