66440789858884 has 27 divisors (see below), whose sum is σ = 135254697377247. Its totient is φ = 28474575318504.

The previous prime is 66440789858843. The next prime is 66440789858921. The reversal of 66440789858884 is 48885898704466.

The square root of 66440789858884 is 8151122.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 113824597 + ... + 114406819.

Almost surely, 2^{66440789858884} is an apocalyptic number.

66440789858884 is the 8151122-nd square number.

It is an amenable number.

66440789858884 is an abundant number, since it is smaller than the sum of its proper divisors (68813907518363).

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

66440789858884 is an frugal number, since it uses more digits than its factorization.

66440789858884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164464 (or 582232 counting only the distinct ones).

The product of its (nonzero) digits is 23781703680, while the sum is 85.

The spelling of 66440789858884 in words is "sixty-six trillion, four hundred forty billion, seven hundred eighty-nine million, eight hundred fifty-eight thousand, eight hundred eighty-four".