665274749 has 2 divisors, whose sum is σ = 665274750. Its totient is φ = 665274748.

The previous prime is 665274677. The next prime is 665274773. The reversal of 665274749 is 947472566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646939225 + 18335524 = 25435^2 + 4282^2 .

It is a cyclic number.

It is not a de Polignac number, because 665274749 - 2¹⁶ = 665209213 is a prime.

It is a super-3 number, since 3×665274749³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665274697 and 665274706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665276749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332637374 + 332637375.

It is an arithmetic number, because the mean of its divisors is an integer number (332637375).

Almost surely, 2^665274749 is an apocalyptic number.

It is an amenable number.

665274749 is a deficient number, since it is larger than the sum of its proper divisors (1).

665274749 is an equidigital number, since it uses as much as digits as its factorization.

665274749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 50.

The square root of 665274749 is about 25792.9205209492. The cubic root of 665274749 is about 872.9720650775.

The spelling of 665274749 in words is "six hundred sixty-five million, two hundred seventy-four thousand, seven hundred forty-nine".