63845237789 has 2 divisors, whose sum is σ = 63845237790. Its totient is φ = 63845237788.

The previous prime is 63845237783. The next prime is 63845237803. The reversal of 63845237789 is 98773254836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57597600025 + 6247637764 = 239995^2 + 79042^2 .

It is a cyclic number.

It is not a de Polignac number, because 63845237789 - 2¹² = 63845233693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63845237783) 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, 31922618894 + 31922618895.

It is an arithmetic number, because the mean of its divisors is an integer number (31922618895).

Almost surely, 2^63845237789 is an apocalyptic number.

It is an amenable number.

63845237789 is a deficient number, since it is larger than the sum of its proper divisors (1).

63845237789 is an equidigital number, since it uses as much as digits as its factorization.

63845237789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 62.

The spelling of 63845237789 in words is "sixty-three billion, eight hundred forty-five million, two hundred thirty-seven thousand, seven hundred eighty-nine".