665259653 has 2 divisors, whose sum is σ = 665259654. Its totient is φ = 665259652.

The previous prime is 665259641. The next prime is 665259677. The reversal of 665259653 is 356952566.

665259653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588644644 + 76615009 = 24262^2 + 8753^2 .

It is a cyclic number.

It is not a de Polignac number, because 665259653 - 2²⁰ = 664211077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665259598 and 665259607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665249653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332629826 + 332629827.

It is an arithmetic number, because the mean of its divisors is an integer number (332629827).

Almost surely, 2^665259653 is an apocalyptic number.

It is an amenable number.

665259653 is a deficient number, since it is larger than the sum of its proper divisors (1).

665259653 is an equidigital number, since it uses as much as digits as its factorization.

665259653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458000, while the sum is 47.

The square root of 665259653 is about 25792.6278808500. The cubic root of 665259653 is about 872.9654620482.

The spelling of 665259653 in words is "six hundred sixty-five million, two hundred fifty-nine thousand, six hundred fifty-three".