665049769 has 2 divisors, whose sum is σ = 665049770. Its totient is φ = 665049768.

The previous prime is 665049767. The next prime is 665049773. The reversal of 665049769 is 967940566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617274025 + 47775744 = 24845^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 665049769 - 2¹ = 665049767 is a prime.

It is a super-2 number, since 2×665049769² = 884582390493906722, which contains 22 as substring.

Together with 665049767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (665049767) 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, 332524884 + 332524885.

It is an arithmetic number, because the mean of its divisors is an integer number (332524885).

Almost surely, 2^665049769 is an apocalyptic number.

It is an amenable number.

665049769 is a deficient number, since it is larger than the sum of its proper divisors (1).

665049769 is an equidigital number, since it uses as much as digits as its factorization.

665049769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The square root of 665049769 is about 25788.5588779210. The cubic root of 665049769 is about 872.8736478952.

It can be divided in two parts, 6650497 and 69, that added together give a palindrome (6650566).

The spelling of 665049769 in words is "six hundred sixty-five million, forty-nine thousand, seven hundred sixty-nine".