665214799 has 2 divisors, whose sum is σ = 665214800. Its totient is φ = 665214798.

The previous prime is 665214769. The next prime is 665214853. The reversal of 665214799 is 997412566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665214799 - 2¹⁹ = 664690511 is a prime.

It is a super-2 number, since 2×665214799² = 885021457617220802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665214769) 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, 332607399 + 332607400.

It is an arithmetic number, because the mean of its divisors is an integer number (332607400).

Almost surely, 2^665214799 is an apocalyptic number.

665214799 is a deficient number, since it is larger than the sum of its proper divisors (1).

665214799 is an equidigital number, since it uses as much as digits as its factorization.

665214799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 665214799 is about 25791.7583541720. The cubic root of 665214799 is about 872.9458422036.

The spelling of 665214799 in words is "six hundred sixty-five million, two hundred fourteen thousand, seven hundred ninety-nine".