66788999 has 2 divisors, whose sum is σ = 66789000. Its totient is φ = 66788998.

The previous prime is 66788963. The next prime is 66789029. The reversal of 66788999 is 99988766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66788999 - 2¹² = 66784903 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 (66788299) 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, 33394499 + 33394500.

It is an arithmetic number, because the mean of its divisors is an integer number (33394500).

Almost surely, 2^66788999 is an apocalyptic number.

66788999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66788999 is an equidigital number, since it uses as much as digits as its factorization.

66788999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 62.

The square root of 66788999 is about 8172.4536707160. The cubic root of 66788999 is about 405.7279981444.

The spelling of 66788999 in words is "sixty-six million, seven hundred eighty-eight thousand, nine hundred ninety-nine".