66880999 has 2 divisors, whose sum is σ = 66881000. Its totient is φ = 66880998.

The previous prime is 66880997. The next prime is 66881027. The reversal of 66880999 is 99908866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66880999 - 2¹ = 66880997 is a prime.

Together with 66880997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66880991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33440499 + 33440500.

It is an arithmetic number, because the mean of its divisors is an integer number (33440500).

Almost surely, 2^66880999 is an apocalyptic number.

66880999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66880999 is an equidigital number, since it uses as much as digits as its factorization.

66880999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 66880999 is about 8178.0803982353. The cubic root of 66880999 is about 405.9142057062.

The spelling of 66880999 in words is "sixty-six million, eight hundred eighty thousand, nine hundred ninety-nine".