66668888668889 has 8 divisors (see below), whose sum is σ = 71803480557312. Its totient is φ = 61535184757200.

The previous prime is 66668888668873. The next prime is 66668888668933. The reversal of 66668888668889 is 98886688886666.

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 66668888668889 - 2⁴ = 66668888668873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66668888668289) 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, 221838239 + ... + 222138564.

It is an arithmetic number, because the mean of its divisors is an integer number (8975435069664).

Almost surely, 2^{66668888668889} is an apocalyptic number.

It is an amenable number.

66668888668889 is a deficient number, since it is larger than the sum of its proper divisors (5134591888423).

66668888668889 is a wasteful number, since it uses less digits than its factorization.

66668888668889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443988367.

The product of its digits is 880602513408, while the sum is 101.

The spelling of 66668888668889 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred eighty-nine".