63654336409 has 2 divisors, whose sum is σ = 63654336410. Its totient is φ = 63654336408.

The previous prime is 63654336367. The next prime is 63654336467. The reversal of 63654336409 is 90463345636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63647721225 + 6615184 = 252285^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 63654336409 - 2¹¹ = 63654334361 is a prime.

It is not a weakly prime, because it can be changed into another prime (63654336479) 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, 31827168204 + 31827168205.

It is an arithmetic number, because the mean of its divisors is an integer number (31827168205).

Almost surely, 2^63654336409 is an apocalyptic number.

It is an amenable number.

63654336409 is a deficient number, since it is larger than the sum of its proper divisors (1).

63654336409 is an equidigital number, since it uses as much as digits as its factorization.

63654336409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 49.

The spelling of 63654336409 in words is "sixty-three billion, six hundred fifty-four million, three hundred thirty-six thousand, four hundred nine".