66755480868 has 18 divisors (see below), whose sum is σ = 168743021174. Its totient is φ = 22251826944.

The previous prime is 66755480867. The next prime is 66755480903. The reversal of 66755480868 is 86808455766.

66755480868 is a `hidden beast` number, since 6 + 6 + 7 + 5 + 548 + 0 + 86 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 66171388644 + 584092224 = 257238^2 + 24168^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (66755480863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 927159421 + ... + 927159492.

Almost surely, 2^66755480868 is an apocalyptic number.

It is an amenable number.

66755480868 is an abundant number, since it is smaller than the sum of its proper divisors (101987540306).

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

66755480868 is a wasteful number, since it uses less digits than its factorization.

66755480868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854318923 (or 1854318918 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 63.

The spelling of 66755480868 in words is "sixty-six billion, seven hundred fifty-five million, four hundred eighty thousand, eight hundred sixty-eight".