665274941 has 2 divisors, whose sum is σ = 665274942. Its totient is φ = 665274940.

The previous prime is 665274917. The next prime is 665274943. The reversal of 665274941 is 149472566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378108025 + 287166916 = 19445^2 + 16946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665274941 is a prime.

It is a super-3 number, since 3×665274941³ (a number of 27 digits) contains 333 as substring.

Together with 665274943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665274892 and 665274901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665274943) 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, 332637470 + 332637471.

It is an arithmetic number, because the mean of its divisors is an integer number (332637471).

Almost surely, 2^665274941 is an apocalyptic number.

It is an amenable number.

665274941 is a deficient number, since it is larger than the sum of its proper divisors (1).

665274941 is an equidigital number, since it uses as much as digits as its factorization.

665274941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 665274941 is about 25792.9242429004. The cubic root of 665274941 is about 872.9721490581.

The spelling of 665274941 in words is "six hundred sixty-five million, two hundred seventy-four thousand, nine hundred forty-one".