656023360644 has 36 divisors (see below), whose sum is σ = 1676913654780. Its totient is φ = 216217436160.

The previous prime is 656023360639. The next prime is 656023360661. The reversal of 656023360644 is 446063320656.

656023360644 is a `hidden beast` number, since 6 + 5 + 6 + 0 + 2 + 33 + 606 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 457408742400 + 198614618244 = 676320^2 + 445662^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 656023360644.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102372477 + ... + 102378884.

It is an arithmetic number, because the mean of its divisors is an integer number (46580934855).

Almost surely, 2^656023360644 is an apocalyptic number.

It is an amenable number.

656023360644 is an abundant number, since it is smaller than the sum of its proper divisors (1020890294136).

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

656023360644 is a wasteful number, since it uses less digits than its factorization.

656023360644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204751460 (or 204751455 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 45.

The spelling of 656023360644 in words is "six hundred fifty-six billion, twenty-three million, three hundred sixty thousand, six hundred forty-four".