63861717709 has 2 divisors, whose sum is σ = 63861717710. Its totient is φ = 63861717708.

The previous prime is 63861717701. The next prime is 63861717719. The reversal of 63861717709 is 90771716836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37013912100 + 26847805609 = 192390^2 + 163853^2 .

It is a cyclic number.

It is not a de Polignac number, because 63861717709 - 2³ = 63861717701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63861717709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63861717701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31930858854 + 31930858855.

It is an arithmetic number, because the mean of its divisors is an integer number (31930858855).

Almost surely, 2^63861717709 is an apocalyptic number.

It is an amenable number.

63861717709 is a deficient number, since it is larger than the sum of its proper divisors (1).

63861717709 is an equidigital number, since it uses as much as digits as its factorization.

63861717709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 63861717709 in words is "sixty-three billion, eight hundred sixty-one million, seven hundred seventeen thousand, seven hundred nine".