63187802221 has 2 divisors, whose sum is σ = 63187802222. Its totient is φ = 63187802220.

The previous prime is 63187802207. The next prime is 63187802233. The reversal of 63187802221 is 12220878136.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61201317321 + 1986484900 = 247389^2 + 44570^2 .

It is a cyclic number.

It is not a de Polignac number, because 63187802221 - 2¹¹ = 63187800173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63187802201) 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, 31593901110 + 31593901111.

It is an arithmetic number, because the mean of its divisors is an integer number (31593901111).

Almost surely, 2^63187802221 is an apocalyptic number.

It is an amenable number.

63187802221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63187802221 is an equidigital number, since it uses as much as digits as its factorization.

63187802221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 63187802221 in words is "sixty-three billion, one hundred eighty-seven million, eight hundred two thousand, two hundred twenty-one".