63618220517 has 2 divisors, whose sum is σ = 63618220518. Its totient is φ = 63618220516.

The previous prime is 63618220507. The next prime is 63618220531. The reversal of 63618220517 is 71502281636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33648032356 + 29970188161 = 183434^2 + 173119^2 .

It is a cyclic number.

It is not a de Polignac number, because 63618220517 - 2⁸ = 63618220261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63618220507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31809110258 + 31809110259.

It is an arithmetic number, because the mean of its divisors is an integer number (31809110259).

Almost surely, 2^63618220517 is an apocalyptic number.

It is an amenable number.

63618220517 is a deficient number, since it is larger than the sum of its proper divisors (1).

63618220517 is an equidigital number, since it uses as much as digits as its factorization.

63618220517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 63618220517 in words is "sixty-three billion, six hundred eighteen million, two hundred twenty thousand, five hundred seventeen".