63555120509 has 2 divisors, whose sum is σ = 63555120510. Its totient is φ = 63555120508.

The previous prime is 63555120443. The next prime is 63555120521. The reversal of 63555120509 is 90502155536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53155608025 + 10399512484 = 230555^2 + 101978^2 .

It is a cyclic number.

It is not a de Polignac number, because 63555120509 - 2²⁴ = 63538343293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63555120539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31777560254 + 31777560255.

It is an arithmetic number, because the mean of its divisors is an integer number (31777560255).

Almost surely, 2^63555120509 is an apocalyptic number.

It is an amenable number.

63555120509 is a deficient number, since it is larger than the sum of its proper divisors (1).

63555120509 is an equidigital number, since it uses as much as digits as its factorization.

63555120509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 41.

The spelling of 63555120509 in words is "sixty-three billion, five hundred fifty-five million, one hundred twenty thousand, five hundred nine".