63818837491 has 2 divisors, whose sum is σ = 63818837492. Its totient is φ = 63818837490.

The previous prime is 63818837483. The next prime is 63818837497. The reversal of 63818837491 is 19473881836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63818837491 - 2³ = 63818837483 is a prime.

It is not a weakly prime, because it can be changed into another prime (63818837497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31909418745 + 31909418746.

It is an arithmetic number, because the mean of its divisors is an integer number (31909418746).

Almost surely, 2^63818837491 is an apocalyptic number.

63818837491 is a deficient number, since it is larger than the sum of its proper divisors (1).

63818837491 is an equidigital number, since it uses as much as digits as its factorization.

63818837491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 58.

The spelling of 63818837491 in words is "sixty-three billion, eight hundred eighteen million, eight hundred thirty-seven thousand, four hundred ninety-one".