665222567 has 2 divisors, whose sum is σ = 665222568. Its totient is φ = 665222566.

The previous prime is 665222489. The next prime is 665222671. The reversal of 665222567 is 765222566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665222567 - 2¹⁴ = 665206183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665272567) 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, 332611283 + 332611284.

It is an arithmetic number, because the mean of its divisors is an integer number (332611284).

Almost surely, 2^665222567 is an apocalyptic number.

665222567 is a deficient number, since it is larger than the sum of its proper divisors (1).

665222567 is an equidigital number, since it uses as much as digits as its factorization.

665222567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 41.

The square root of 665222567 is about 25791.9089444733. The cubic root of 665222567 is about 872.9492401121.

Subtracting 665222567 from its reverse (765222566), we obtain a palindrome (99999999).

The spelling of 665222567 in words is "six hundred sixty-five million, two hundred twenty-two thousand, five hundred sixty-seven".