666668899999 has 16 divisors (see below), whose sum is σ = 709758167040. Its totient is φ = 624011667840.

The previous prime is 666668899987. The next prime is 666668900003. The reversal of 666668899999 is 999998866666.

666668899999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666668899999 is a prime.

666668899999 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 (666668890999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14143132 + ... + 14190190.

It is an arithmetic number, because the mean of its divisors is an integer number (44359885440).

Almost surely, 2^666668899999 is an apocalyptic number.

666668899999 is a deficient number, since it is larger than the sum of its proper divisors (43089267041).

666668899999 is a wasteful number, since it uses less digits than its factorization.

666668899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51630.

The product of its digits is 29386561536, while the sum is 91.

The spelling of 666668899999 in words is "six hundred sixty-six billion, six hundred sixty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".