5666778456729 has 16 divisors (see below), whose sum is σ = 8211563236800. Its totient is φ = 3455255174976.

The previous prime is 5666778456727. The next prime is 5666778456803. The reversal of 5666778456729 is 9276548776665.

It is not a de Polignac number, because 5666778456729 - 2¹ = 5666778456727 is a prime.

It is a super-3 number, since 3×5666778456729³ (a number of 39 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (5666778456721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666518739 + ... + 666527240.

It is an arithmetic number, because the mean of its divisors is an integer number (513222702300).

Almost surely, 2^{5666778456729} is an apocalyptic number.

It is an amenable number.

5666778456729 is a deficient number, since it is larger than the sum of its proper divisors (2544784780071).

5666778456729 is a wasteful number, since it uses less digits than its factorization.

5666778456729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333046104.

The product of its digits is 6401203200, while the sum is 78.

The spelling of 5666778456729 in words is "five trillion, six hundred sixty-six billion, seven hundred seventy-eight million, four hundred fifty-six thousand, seven hundred twenty-nine".