66433685649 has 32 divisors (see below), whose sum is σ = 95377735680. Its totient is φ = 41006129472.

The previous prime is 66433685621. The next prime is 66433685683. The reversal of 66433685649 is 94658633466.

It is not a de Polignac number, because 66433685649 - 2⁸ = 66433685393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66433685592 and 66433685601.

It is not an unprimeable number, because it can be changed into a prime (66433685249) 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 31 ways as a sum of consecutive naturals, for example, 416527 + ... + 553499.

It is an arithmetic number, because the mean of its divisors is an integer number (2980554240).

Almost surely, 2^66433685649 is an apocalyptic number.

It is an amenable number.

66433685649 is a deficient number, since it is larger than the sum of its proper divisors (28944050031).

66433685649 is a wasteful number, since it uses less digits than its factorization.

66433685649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137189.

The product of its digits is 67184640, while the sum is 60.

The spelling of 66433685649 in words is "sixty-six billion, four hundred thirty-three million, six hundred eighty-five thousand, six hundred forty-nine".