653945581648 has 20 divisors (see below), whose sum is σ = 1267614754740. Its totient is φ = 326819193344.

The previous prime is 653945581637. The next prime is 653945581651. The reversal of 653945581648 is 846185549356.

It can be written as a sum of positive squares in 2 ways, for example, as 261558599184 + 392386982464 = 511428^2 + 626408^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 653945581648.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9564715 + ... + 9632842.

It is an arithmetic number, because the mean of its divisors is an integer number (63380737737).

Almost surely, 2^653945581648 is an apocalyptic number.

It is an amenable number.

653945581648 is a deficient number, since it is larger than the sum of its proper divisors (613669173092).

653945581648 is a wasteful number, since it uses less digits than its factorization.

653945581648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19199694 (or 19199688 counting only the distinct ones).

The product of its digits is 124416000, while the sum is 64.

The spelling of 653945581648 in words is "six hundred fifty-three billion, nine hundred forty-five million, five hundred eighty-one thousand, six hundred forty-eight".