666788899999 has 2 divisors, whose sum is σ = 666788900000. Its totient is φ = 666788899998.

The previous prime is 666788899991. The next prime is 666788900021. The reversal of 666788899999 is 999998887666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666788899999 - 2³ = 666788899991 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 (666788899991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333394449999 + 333394450000.

It is an arithmetic number, because the mean of its divisors is an integer number (333394450000).

Almost surely, 2^666788899999 is an apocalyptic number.

666788899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

666788899999 is an equidigital number, since it uses as much as digits as its factorization.

666788899999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45712429056, while the sum is 94.

The spelling of 666788899999 in words is "six hundred sixty-six billion, seven hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".