63505617209 has 2 divisors, whose sum is σ = 63505617210. Its totient is φ = 63505617208.

The previous prime is 63505617191. The next prime is 63505617283. The reversal of 63505617209 is 90271650536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56691610000 + 6814007209 = 238100^2 + 82547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63505617209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63505617209.

It is not a weakly prime, because it can be changed into another prime (63505617709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31752808604 + 31752808605.

It is an arithmetic number, because the mean of its divisors is an integer number (31752808605).

Almost surely, 2^63505617209 is an apocalyptic number.

It is an amenable number.

63505617209 is a deficient number, since it is larger than the sum of its proper divisors (1).

63505617209 is an equidigital number, since it uses as much as digits as its factorization.

63505617209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 44.

The spelling of 63505617209 in words is "sixty-three billion, five hundred five million, six hundred seventeen thousand, two hundred nine".