63557229217 has 2 divisors, whose sum is σ = 63557229218. Its totient is φ = 63557229216.

The previous prime is 63557229179. The next prime is 63557229221. The reversal of 63557229217 is 71292275536.

63557229217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62788331776 + 768897441 = 250576^2 + 27729^2 .

It is a cyclic number.

It is not a de Polignac number, because 63557229217 - 2¹⁵ = 63557196449 is a prime.

It is not a weakly prime, because it can be changed into another prime (63557229227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31778614608 + 31778614609.

It is an arithmetic number, because the mean of its divisors is an integer number (31778614609).

Almost surely, 2^63557229217 is an apocalyptic number.

It is an amenable number.

63557229217 is a deficient number, since it is larger than the sum of its proper divisors (1).

63557229217 is an equidigital number, since it uses as much as digits as its factorization.

63557229217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 49.

The spelling of 63557229217 in words is "sixty-three billion, five hundred fifty-seven million, two hundred twenty-nine thousand, two hundred seventeen".