66688888999 has 8 divisors (see below), whose sum is σ = 69695976960. Its totient is φ = 63690765336.

The previous prime is 66688888997. The next prime is 66688889021. The reversal of 66688888999 is 99988888666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66688888999 - 2¹ = 66688888997 is a prime.

66688888999 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66688888997) 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, 2225859 + ... + 2255620.

It is an arithmetic number, because the mean of its divisors is an integer number (8711997120).

Almost surely, 2^66688888999 is an apocalyptic number.

66688888999 is a deficient number, since it is larger than the sum of its proper divisors (3007087961).

66688888999 is a wasteful number, since it uses less digits than its factorization.

66688888999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482149.

The product of its digits is 5159780352, while the sum is 85.

The spelling of 66688888999 in words is "sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred ninety-nine".