648561655460 has 12 divisors (see below), whose sum is σ = 1361979476508. Its totient is φ = 259424662176.

The previous prime is 648561655453. The next prime is 648561655463. The reversal of 648561655460 is 64556165846.

It can be written as a sum of positive squares in 2 ways, for example, as 459282711616 + 189278943844 = 677704^2 + 435062^2 .

It is a junction number, because it is equal to n+sod(n) for n = 648561655396 and 648561655405.

It is not an unprimeable number, because it can be changed into a prime (648561655463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16214041367 + ... + 16214041406.

It is an arithmetic number, because the mean of its divisors is an integer number (113498289709).

Almost surely, 2^648561655460 is an apocalyptic number.

It is an amenable number.

648561655460 is an abundant number, since it is smaller than the sum of its proper divisors (713417821048).

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

648561655460 is a wasteful number, since it uses less digits than its factorization.

648561655460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32428082782 (or 32428082780 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 56.

The spelling of 648561655460 in words is "six hundred forty-eight billion, five hundred sixty-one million, six hundred fifty-five thousand, four hundred sixty".