66717644012344 has 64 divisors (see below), whose sum is σ = 135467923500000. Its totient is φ = 30621434088960.

The previous prime is 66717644012207. The next prime is 66717644012359. The reversal of 66717644012344 is 44321044671766.

It is a super-2 number, since 2×66717644012344² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635238667 + ... + 635343685.

Almost surely, 2^{66717644012344} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66717644012344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67733961750000).

66717644012344 is an abundant number, since it is smaller than the sum of its proper divisors (68750279487656).

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

66717644012344 is a wasteful number, since it uses less digits than its factorization.

66717644012344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138968 (or 138964 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 55.

The spelling of 66717644012344 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, twelve thousand, three hundred forty-four".