66755466880 has 32 divisors (see below), whose sum is σ = 159587289540. Its totient is φ = 26702186496.

The previous prime is 66755466857. The next prime is 66755466889. The reversal of 66755466880 is 8866455766.

It can be written as a sum of positive squares in 2 ways, for example, as 64430684224 + 2324782656 = 253832^2 + 48216^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (66755466889) 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 3 ways as a sum of consecutive naturals, for example, 52152069 + ... + 52153348.

Almost surely, 2^66755466880 is an apocalyptic number.

It is an amenable number.

66755466880 is an abundant number, since it is smaller than the sum of its proper divisors (92831822660).

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

66755466880 is a wasteful number, since it uses less digits than its factorization.

66755466880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104305436 (or 104305424 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 61.

The spelling of 66755466880 in words is "sixty-six billion, seven hundred fifty-five million, four hundred sixty-six thousand, eight hundred eighty".