63128551891 has 2 divisors, whose sum is σ = 63128551892. Its totient is φ = 63128551890.

The previous prime is 63128551883. The next prime is 63128551919. The reversal of 63128551891 is 19815582136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63128551891 - 2³ = 63128551883 is a prime.

It is not a weakly prime, because it can be changed into another prime (63128551841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31564275945 + 31564275946.

It is an arithmetic number, because the mean of its divisors is an integer number (31564275946).

Almost surely, 2^63128551891 is an apocalyptic number.

63128551891 is a deficient number, since it is larger than the sum of its proper divisors (1).

63128551891 is an equidigital number, since it uses as much as digits as its factorization.

63128551891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 49.

The spelling of 63128551891 in words is "sixty-three billion, one hundred twenty-eight million, five hundred fifty-one thousand, eight hundred ninety-one".