63438221929 has 2 divisors, whose sum is σ = 63438221930. Its totient is φ = 63438221928.

The previous prime is 63438221927. The next prime is 63438221933. The reversal of 63438221929 is 92912283436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33560408025 + 29877813904 = 183195^2 + 172852^2 .

It is a cyclic number.

It is not a de Polignac number, because 63438221929 - 2¹ = 63438221927 is a prime.

Together with 63438221927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63438221927) 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, 31719110964 + 31719110965.

It is an arithmetic number, because the mean of its divisors is an integer number (31719110965).

Almost surely, 2^63438221929 is an apocalyptic number.

It is an amenable number.

63438221929 is a deficient number, since it is larger than the sum of its proper divisors (1).

63438221929 is an equidigital number, since it uses as much as digits as its factorization.

63438221929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 49.

The spelling of 63438221929 in words is "sixty-three billion, four hundred thirty-eight million, two hundred twenty-one thousand, nine hundred twenty-nine".