63121553555 has 12 divisors (see below), whose sum is σ = 78447862272. Its totient is φ = 48755955360.

The previous prime is 63121553549. The next prime is 63121553569. The reversal of 63121553555 is 55535512136.

It is not a de Polignac number, because 63121553555 - 2⁶ = 63121553491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 7501331 + ... + 7509740.

It is an arithmetic number, because the mean of its divisors is an integer number (6537321856).

Almost surely, 2^63121553555 is an apocalyptic number.

63121553555 is a deficient number, since it is larger than the sum of its proper divisors (15326308717).

63121553555 is a wasteful number, since it uses less digits than its factorization.

63121553555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15011134 (or 15011105 counting only the distinct ones).

The product of its digits is 337500, while the sum is 41.

The spelling of 63121553555 in words is "sixty-three billion, one hundred twenty-one million, five hundred fifty-three thousand, five hundred fifty-five".