66843379712 has 108 divisors (see below), whose sum is σ = 139128022215. Its totient is φ = 32105414656.

The previous prime is 66843379711. The next prime is 66843379787. The reversal of 66843379712 is 21797334866.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 65913373696 + 930006016 = 256736^2 + 30496^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=182816.

It is a super-2 number, since 2×66843379712² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66843379711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 339306398 + ... + 339306594.

Almost surely, 2^66843379712 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 66843379712

66843379712 is an abundant number, since it is smaller than the sum of its proper divisors (72284642503).

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

66843379712 is an frugal number, since it uses more digits than its factorization.

66843379712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 228 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 56.

The spelling of 66843379712 in words is "sixty-six billion, eight hundred forty-three million, three hundred seventy-nine thousand, seven hundred twelve".