63821865550 has 24 divisors (see below), whose sum is σ = 118741123296. Its totient is φ = 25521767040.

The previous prime is 63821865539. The next prime is 63821865553. The reversal of 63821865550 is 5556812836.

It is a junction number, because it is equal to n+sod(n) for n = 63821865494 and 63821865503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63821865553) 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 in 11 ways as a sum of consecutive naturals, for example, 12219 + ... + 357481.

It is an arithmetic number, because the mean of its divisors is an integer number (4947546804).

Almost surely, 2^63821865550 is an apocalyptic number.

63821865550 is a deficient number, since it is larger than the sum of its proper divisors (54919257746).

63821865550 is a wasteful number, since it uses less digits than its factorization.

63821865550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348972 (or 348967 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 63821865550 in words is "sixty-three billion, eight hundred twenty-one million, eight hundred sixty-five thousand, five hundred fifty".