63678984121 has 2 divisors, whose sum is σ = 63678984122. Its totient is φ = 63678984120.

The previous prime is 63678984119. The next prime is 63678984137. The reversal of 63678984121 is 12148987636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47007009721 + 16671974400 = 216811^2 + 129120^2 .

It is a cyclic number.

It is not a de Polignac number, because 63678984121 - 2¹ = 63678984119 is a prime.

Together with 63678984119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63678984221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31839492060 + 31839492061.

It is an arithmetic number, because the mean of its divisors is an integer number (31839492061).

Almost surely, 2^63678984121 is an apocalyptic number.

It is an amenable number.

63678984121 is a deficient number, since it is larger than the sum of its proper divisors (1).

63678984121 is an equidigital number, since it uses as much as digits as its factorization.

63678984121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 55.

The spelling of 63678984121 in words is "sixty-three billion, six hundred seventy-eight million, nine hundred eighty-four thousand, one hundred twenty-one".