63505490491 has 2 divisors, whose sum is σ = 63505490492. Its totient is φ = 63505490490.

The previous prime is 63505490473. The next prime is 63505490501. The reversal of 63505490491 is 19409450536.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63505490491 - 2¹¹ = 63505488443 is a prime.

It is not a weakly prime, because it can be changed into another prime (63505490431) 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, 31752745245 + 31752745246.

It is an arithmetic number, because the mean of its divisors is an integer number (31752745246).

Almost surely, 2^63505490491 is an apocalyptic number.

63505490491 is a deficient number, since it is larger than the sum of its proper divisors (1).

63505490491 is an equidigital number, since it uses as much as digits as its factorization.

63505490491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 63505490491 in words is "sixty-three billion, five hundred five million, four hundred ninety thousand, four hundred ninety-one".