66717644012244 has 36 divisors (see below), whose sum is σ = 170223521648544. Its totient is φ = 22031371541712.

The previous prime is 66717644012207. The next prime is 66717644012359. The reversal of 66717644012244 is 44221044671766.

It is a happy number.

66717644012244 is a `hidden beast` number, since 6 + 6 + 7 + 1 + 7 + 6 + 4 + 401 + 224 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8660126472 + ... + 8660134175.

It is an arithmetic number, because the mean of its divisors is an integer number (4728431156904).

Almost surely, 2^{66717644012244} is an apocalyptic number.

It is an amenable number.

66717644012244 is an abundant number, since it is smaller than the sum of its proper divisors (103505877636300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66717644012244 is a wasteful number, since it uses less digits than its factorization.

66717644012244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17320260764 (or 17320260759 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 54.

The spelling of 66717644012244 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, twelve thousand, two hundred forty-four".