66433685650 has 12 divisors (see below), whose sum is σ = 123566655402. Its totient is φ = 26573474240.

The previous prime is 66433685621. The next prime is 66433685683. The reversal of 66433685650 is 5658633466.

It can be written as a sum of positive squares in 3 ways, for example, as 39298701121 + 27134984529 = 198239^2 + 164727^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 664336807 + ... + 664336906.

Almost surely, 2^66433685650 is an apocalyptic number.

66433685650 is a deficient number, since it is larger than the sum of its proper divisors (57132969752).

66433685650 is a wasteful number, since it uses less digits than its factorization.

66433685650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328673725 (or 1328673720 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 66433685650 in words is "sixty-six billion, four hundred thirty-three million, six hundred eighty-five thousand, six hundred fifty".