6505561556656 has 40 divisors (see below), whose sum is σ = 13514904544320. Its totient is φ = 3022688308224.

The previous prime is 6505561556633. The next prime is 6505561556693. The reversal of 6505561556656 is 6566551655056.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6505561556594 and 6505561556603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151355131 + ... + 151398106.

It is an arithmetic number, because the mean of its divisors is an integer number (337872613608).

Almost surely, 2^{6505561556656} is an apocalyptic number.

It is an amenable number.

6505561556656 is an abundant number, since it is smaller than the sum of its proper divisors (7009342987664).

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

6505561556656 is a wasteful number, since it uses less digits than its factorization.

6505561556656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302753341 (or 302753335 counting only the distinct ones).

The product of its (nonzero) digits is 121500000, while the sum is 61.

The spelling of 6505561556656 in words is "six trillion, five hundred five billion, five hundred sixty-one million, five hundred fifty-six thousand, six hundred fifty-six".