63393671921 has 2 divisors, whose sum is σ = 63393671922. Its totient is φ = 63393671920.

The previous prime is 63393671851. The next prime is 63393671927. The reversal of 63393671921 is 12917639336.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35857588321 + 27536083600 = 189361^2 + 165940^2 .

It is a cyclic number.

It is not a de Polignac number, because 63393671921 - 2¹⁰ = 63393670897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63393671921.

It is not a weakly prime, because it can be changed into another prime (63393671927) 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, 31696835960 + 31696835961.

It is an arithmetic number, because the mean of its divisors is an integer number (31696835961).

Almost surely, 2^63393671921 is an apocalyptic number.

It is an amenable number.

63393671921 is a deficient number, since it is larger than the sum of its proper divisors (1).

63393671921 is an equidigital number, since it uses as much as digits as its factorization.

63393671921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 50.

The spelling of 63393671921 in words is "sixty-three billion, three hundred ninety-three million, six hundred seventy-one thousand, nine hundred twenty-one".