63218731939 has 64 divisors (see below), whose sum is σ = 75476344320. Its totient is φ = 52777296000.

The previous prime is 63218731871. The next prime is 63218731969. The reversal of 63218731939 is 93913781236.

It is not a de Polignac number, because 63218731939 - 2¹¹ = 63218729891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63218731969) 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 63 ways as a sum of consecutive naturals, for example, 135371784 + ... + 135372250.

It is an arithmetic number, because the mean of its divisors is an integer number (1179317880).

Almost surely, 2^63218731939 is an apocalyptic number.

63218731939 is a deficient number, since it is larger than the sum of its proper divisors (12257612381).

63218731939 is a wasteful number, since it uses less digits than its factorization.

63218731939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 651 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 52.

The spelling of 63218731939 in words is "sixty-three billion, two hundred eighteen million, seven hundred thirty-one thousand, nine hundred thirty-nine".