665513377 has 2 divisors, whose sum is σ = 665513378. Its totient is φ = 665513376.

The previous prime is 665513369. The next prime is 665513389. The reversal of 665513377 is 773315566.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599074576 + 66438801 = 24476^2 + 8151^2 .

It is a cyclic number.

It is not a de Polignac number, because 665513377 - 2³ = 665513369 is a prime.

It is not a weakly prime, because it can be changed into another prime (665513327) 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, 332756688 + 332756689.

It is an arithmetic number, because the mean of its divisors is an integer number (332756689).

Almost surely, 2^665513377 is an apocalyptic number.

It is an amenable number.

665513377 is a deficient number, since it is larger than the sum of its proper divisors (1).

665513377 is an equidigital number, since it uses as much as digits as its factorization.

665513377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 43.

The square root of 665513377 is about 25797.5459491790. The cubic root of 665513377 is about 873.0764283130.

The spelling of 665513377 in words is "six hundred sixty-five million, five hundred thirteen thousand, three hundred seventy-seven".