63587517221 has 2 divisors, whose sum is σ = 63587517222. Its totient is φ = 63587517220.

The previous prime is 63587517209. The next prime is 63587517233. The reversal of 63587517221 is 12271578536.

It is a balanced prime because it is at equal distance from previous prime (63587517209) and next prime (63587517233).

It can be written as a sum of positive squares in only one way, i.e., 46391128996 + 17196388225 = 215386^2 + 131135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63587517221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63587517241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31793758610 + 31793758611.

It is an arithmetic number, because the mean of its divisors is an integer number (31793758611).

Almost surely, 2^63587517221 is an apocalyptic number.

It is an amenable number.

63587517221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63587517221 is an equidigital number, since it uses as much as digits as its factorization.

63587517221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 47.

The spelling of 63587517221 in words is "sixty-three billion, five hundred eighty-seven million, five hundred seventeen thousand, two hundred twenty-one".