66888888666688 has 56 divisors (see below), whose sum is σ = 145608176530080. Its totient is φ = 30234185272320.

The previous prime is 66888888666683. The next prime is 66888888666701. The reversal of 66888888666688 is 88666688888866.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66888888666593 and 66888888666602.

It is not an unprimeable number, because it can be changed into a prime (66888888666683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265272381 + ... + 265524412.

It is a self-describing number.

Almost surely, 2^{66888888666688} is an apocalyptic number.

It is an amenable number.

66888888666688 is an abundant number, since it is smaller than the sum of its proper divisors (78719287863392).

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

66888888666688 is a wasteful number, since it uses less digits than its factorization.

66888888666688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530796995 (or 530796985 counting only the distinct ones).

The product of its digits is 782757789696, while the sum is 100.

It can be divided in two parts, 66888888 and 666688, that added together give a palindrome (67555576).

The spelling of 66888888666688 in words is "sixty-six trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, six hundred sixty-six thousand, six hundred eighty-eight".