648138942882 has 18 divisors (see below), whose sum is σ = 1404308443473. Its totient is φ = 216045175752.

The previous prime is 648138942881. The next prime is 648138942929. The reversal of 648138942882 is 288249831846.

648138942882 is a `hidden beast` number, since 6 + 48 + 13 + 89 + 428 + 82 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 565776256761 + 82362686121 = 752181^2 + 286989^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=569271.

It is not an unprimeable number, because it can be changed into a prime (648138942881) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 3320748 + ... + 3510504.

Almost surely, 2^648138942882 is an apocalyptic number.

648138942882 is an abundant number, since it is smaller than the sum of its proper divisors (756169500591).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648138942882 is an frugal number, since it uses more digits than its factorization.

648138942882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379522 (or 189762 counting only the distinct ones).

The product of its digits is 42467328, while the sum is 63.

The spelling of 648138942882 in words is "six hundred forty-eight billion, one hundred thirty-eight million, nine hundred forty-two thousand, eight hundred eighty-two".