665005741 has 2 divisors, whose sum is σ = 665005742. Its totient is φ = 665005740.

The previous prime is 665005723. The next prime is 665005751. The reversal of 665005741 is 147500566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664556841 + 448900 = 25779^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 665005741 - 2⁵ = 665005709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665005697 and 665005706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665005751) 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, 332502870 + 332502871.

It is an arithmetic number, because the mean of its divisors is an integer number (332502871).

Almost surely, 2^665005741 is an apocalyptic number.

It is an amenable number.

665005741 is a deficient number, since it is larger than the sum of its proper divisors (1).

665005741 is an equidigital number, since it uses as much as digits as its factorization.

665005741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 665005741 is about 25787.7052294306. The cubic root of 665005741 is about 872.8543853122.

The spelling of 665005741 in words is "six hundred sixty-five million, five thousand, seven hundred forty-one".