63783321251 has 16 divisors (see below), whose sum is σ = 69250644288. Its totient is φ = 58397328000.

The previous prime is 63783321191. The next prime is 63783321257. The reversal of 63783321251 is 15212338736.

It is a cyclic number.

It is not a de Polignac number, because 63783321251 - 2¹⁸ = 63783059107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63783321199 and 63783321208.

It is not an unprimeable number, because it can be changed into a prime (63783321257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1272965 + ... + 1322121.

It is an arithmetic number, because the mean of its divisors is an integer number (4328165268).

Almost surely, 2^63783321251 is an apocalyptic number.

63783321251 is a deficient number, since it is larger than the sum of its proper divisors (5467323037).

63783321251 is a wasteful number, since it uses less digits than its factorization.

63783321251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49982.

The product of its digits is 181440, while the sum is 41.

Adding to 63783321251 its reverse (15212338736), we get a palindrome (78995659987).

The spelling of 63783321251 in words is "sixty-three billion, seven hundred eighty-three million, three hundred twenty-one thousand, two hundred fifty-one".