66567641860 has 12 divisors (see below), whose sum is σ = 139792047948. Its totient is φ = 26627056736.

The previous prime is 66567641851. The next prime is 66567641911. The reversal of 66567641860 is 6814676566.

It can be written as a sum of positive squares in 2 ways, for example, as 12713013504 + 53854628356 = 112752^2 + 232066^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664191027 + ... + 1664191066.

It is an arithmetic number, because the mean of its divisors is an integer number (11649337329).

Almost surely, 2^66567641860 is an apocalyptic number.

It is an amenable number.

66567641860 is an abundant number, since it is smaller than the sum of its proper divisors (73224406088).

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

66567641860 is a wasteful number, since it uses less digits than its factorization.

66567641860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328382102 (or 3328382100 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 66567641860 in words is "sixty-six billion, five hundred sixty-seven million, six hundred forty-one thousand, eight hundred sixty".