66888888888899 has 96 divisors (see below), whose sum is σ = 85520155163520. Its totient is φ = 51200371537920.

The previous prime is 66888888888881. The next prime is 66888888889021. The reversal of 66888888888899 is 99888888888866.

It is a happy number.

It is not a de Polignac number, because 66888888888899 - 2¹² = 66888888884803 is a prime.

66888888888899 is a strobogrammatic number because it is the same when read upside-down.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66888888888899.

It is not an unprimeable number, because it can be changed into a prime (66888888888839) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22993772657 + ... + 22993775565.

It is an arithmetic number, because the mean of its divisors is an integer number (890834949620).

Almost surely, 2^{66888888888899} is an apocalyptic number.

66888888888899 is a deficient number, since it is larger than the sum of its proper divisors (18631266274621).

66888888888899 is a wasteful number, since it uses less digits than its factorization.

66888888888899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381 (or 4370 counting only the distinct ones).

The product of its digits is 3131031158784, while the sum is 110.

The spelling of 66888888888899 in words is "sixty-six trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-nine".