665276749 has 2 divisors, whose sum is σ = 665276750. Its totient is φ = 665276748.

The previous prime is 665276719. The next prime is 665276753. The reversal of 665276749 is 947672566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661415524 + 3861225 = 25718^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 665276749 - 2⁹ = 665276237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665276696 and 665276705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665276719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332638374 + 332638375.

It is an arithmetic number, because the mean of its divisors is an integer number (332638375).

Almost surely, 2^665276749 is an apocalyptic number.

It is an amenable number.

665276749 is a deficient number, since it is larger than the sum of its proper divisors (1).

665276749 is an equidigital number, since it uses as much as digits as its factorization.

665276749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 52.

The square root of 665276749 is about 25792.9592912485. The cubic root of 665276749 is about 872.9729398751.

The spelling of 665276749 in words is "six hundred sixty-five million, two hundred seventy-six thousand, seven hundred forty-nine".