63451205491 has 2 divisors, whose sum is σ = 63451205492. Its totient is φ = 63451205490.

The previous prime is 63451205479. The next prime is 63451205551. The reversal of 63451205491 is 19450215436.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63451205491 - 2²³ = 63442816883 is a prime.

It is a super-2 number, since 2×63451205491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63451205471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31725602745 + 31725602746.

It is an arithmetic number, because the mean of its divisors is an integer number (31725602746).

Almost surely, 2^63451205491 is an apocalyptic number.

63451205491 is a deficient number, since it is larger than the sum of its proper divisors (1).

63451205491 is an equidigital number, since it uses as much as digits as its factorization.

63451205491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 63451205491 in words is "sixty-three billion, four hundred fifty-one million, two hundred five thousand, four hundred ninety-one".