665424769 has 2 divisors, whose sum is σ = 665424770. Its totient is φ = 665424768.

The previous prime is 665424763. The next prime is 665424791. The reversal of 665424769 is 967424566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523814769 + 141610000 = 22887^2 + 11900^2 .

It is a cyclic number.

It is not a de Polignac number, because 665424769 - 2⁵ = 665424737 is a prime.

It is a super-2 number, since 2×665424769² = 885580246397406722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (665424763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332712384 + 332712385.

It is an arithmetic number, because the mean of its divisors is an integer number (332712385).

Almost surely, 2^665424769 is an apocalyptic number.

It is an amenable number.

665424769 is a deficient number, since it is larger than the sum of its proper divisors (1).

665424769 is an equidigital number, since it uses as much as digits as its factorization.

665424769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 49.

The square root of 665424769 is about 25795.8285193556. The cubic root of 665424769 is about 873.0376787839.

The spelling of 665424769 in words is "six hundred sixty-five million, four hundred twenty-four thousand, seven hundred sixty-nine".