656243650404 has 36 divisors (see below), whose sum is σ = 1690136953596. Its totient is φ = 214620564288.

The previous prime is 656243650313. The next prime is 656243650409. The reversal of 656243650404 is 404056342656.

It is a happy number.

656243650404 is a `hidden beast` number, since 6 + 562 + 4 + 36 + 50 + 4 + 0 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 307246272804 + 348997377600 = 554298^2 + 590760^2 .

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

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 656243650404.

It is not an unprimeable number, because it can be changed into a prime (656243650409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171969699 + ... + 171973514.

It is an arithmetic number, because the mean of its divisors is an integer number (46948248711).

Almost surely, 2^656243650404 is an apocalyptic number.

It is an amenable number.

656243650404 is an abundant number, since it is smaller than the sum of its proper divisors (1033893303192).

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

656243650404 is a wasteful number, since it uses less digits than its factorization.

656243650404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343943276 (or 343943271 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 45.

The spelling of 656243650404 in words is "six hundred fifty-six billion, two hundred forty-three million, six hundred fifty thousand, four hundred four".