66776568872 has 64 divisors (see below), whose sum is σ = 135533186880. Its totient is φ = 30661327872.

The previous prime is 66776568853. The next prime is 66776568913. The reversal of 66776568872 is 27886567766.

It is a super-2 number, since 2×66776568872² (a number of 22 digits) contains 22 as substring.

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, 18328283 + ... + 18331925.

It is an arithmetic number, because the mean of its divisors is an integer number (2117706045).

Almost surely, 2^66776568872 is an apocalyptic number.

It is an amenable number.

66776568872 is an abundant number, since it is smaller than the sum of its proper divisors (68756618008).

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

66776568872 is a wasteful number, since it uses less digits than its factorization.

66776568872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522 (or 4518 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 68.

It can be divided in two parts, 667765 and 68872, that added together give a palindrome (736637).

The spelling of 66776568872 in words is "sixty-six billion, seven hundred seventy-six million, five hundred sixty-eight thousand, eight hundred seventy-two".