63285721813 has 2 divisors, whose sum is σ = 63285721814. Its totient is φ = 63285721812.

The previous prime is 63285721771. The next prime is 63285721861. The reversal of 63285721813 is 31812758236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62248753009 + 1036968804 = 249497^2 + 32202^2 .

It is a cyclic number.

It is not a de Polignac number, because 63285721813 - 2¹⁷ = 63285590741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63285721613) 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, 31642860906 + 31642860907.

It is an arithmetic number, because the mean of its divisors is an integer number (31642860907).

Almost surely, 2^63285721813 is an apocalyptic number.

It is an amenable number.

63285721813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63285721813 is an equidigital number, since it uses as much as digits as its factorization.

63285721813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The spelling of 63285721813 in words is "sixty-three billion, two hundred eighty-five million, seven hundred twenty-one thousand, eight hundred thirteen".