66224460440645 has 8 divisors (see below), whose sum is σ = 85582379646456. Its totient is φ = 48904216940736.

The previous prime is 66224460440617. The next prime is 66224460440711. The reversal of 66224460440645 is 54604406442266.

It can be written as a sum of positive squares in 4 ways, for example, as 10238060891809 + 55986399548836 = 3199697^2 + 7482406^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66224460440645 - 2¹⁶ = 66224460375109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509418926402 + ... + 509418926531.

It is an arithmetic number, because the mean of its divisors is an integer number (10697797455807).

Almost surely, 2^{66224460440645} is an apocalyptic number.

66224460440645 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66224460440645 is a deficient number, since it is larger than the sum of its proper divisors (19357919205811).

66224460440645 is a wasteful number, since it uses less digits than its factorization.

66224460440645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018837852951.

The product of its (nonzero) digits is 26542080, while the sum is 53.

The spelling of 66224460440645 in words is "sixty-six trillion, two hundred twenty-four billion, four hundred sixty million, four hundred forty thousand, six hundred forty-five".