667888889999 has 2 divisors, whose sum is σ = 667888890000. Its totient is φ = 667888889998.

The previous prime is 667888889953. The next prime is 667888890037. The reversal of 667888889999 is 999988888766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667888889999 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667888889909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333944444999 + 333944445000.

It is an arithmetic number, because the mean of its divisors is an integer number (333944445000).

Almost surely, 2^667888889999 is an apocalyptic number.

667888889999 is a deficient number, since it is larger than the sum of its proper divisors (1).

667888889999 is an equidigital number, since it uses as much as digits as its factorization.

667888889999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54177693696, while the sum is 95.

The spelling of 667888889999 in words is "six hundred sixty-seven billion, eight hundred eighty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-nine".