66679306569 has 16 divisors (see below), whose sum is σ = 98859791040. Its totient is φ = 44418836160.

The previous prime is 66679306549. The next prime is 66679306621. The reversal of 66679306569 is 96560397666.

It is not a de Polignac number, because 66679306569 - 2¹¹ = 66679304521 is a prime.

It is a super-4 number, since 4×66679306569⁴ (a number of 44 digits) contains 4444 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 (66679306549) 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, 909472 + ... + 980049.

It is an arithmetic number, because the mean of its divisors is an integer number (6178736940).

Almost surely, 2^66679306569 is an apocalyptic number.

It is an amenable number.

66679306569 is a deficient number, since it is larger than the sum of its proper divisors (32180484471).

66679306569 is a wasteful number, since it uses less digits than its factorization.

66679306569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890837 (or 1890831 counting only the distinct ones).

The product of its (nonzero) digits is 66134880, while the sum is 63.

It can be divided in two parts, 66679 and 306569, that added together give a cube (373248 = 72³).

The spelling of 66679306569 in words is "sixty-six billion, six hundred seventy-nine million, three hundred six thousand, five hundred sixty-nine".