6566557536648 has 36 divisors (see below), whose sum is σ = 17784485551365. Its totient is φ = 2188845264288.

The previous prime is 6566557536607. The next prime is 6566557536697. The reversal of 6566557536648 is 8466357556656.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

6566557536648 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 5 + 575 + 3 + 6 + 6 + 48 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5420505927204 + 1146051609444 = 2328198^2 + 1070538^2 .

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

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1811982.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21592786 + ... + 21894782.

Almost surely, 2^{6566557536648} is an apocalyptic number.

It is an amenable number.

6566557536648 is an abundant number, since it is smaller than the sum of its proper divisors (11217928014717).

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

6566557536648 is an frugal number, since it uses more digits than its factorization.

6566557536648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604006 (or 302002 counting only the distinct ones).

The product of its digits is 3265920000, while the sum is 72.

Multiplying 6566557536648 by its sum of digits (72), we get a square (472792142638656 = 21743784²).

6566557536648 divided by its sum of digits (72) gives a square (91202188009 = 301997²).

The spelling of 6566557536648 in words is "six trillion, five hundred sixty-six billion, five hundred fifty-seven million, five hundred thirty-six thousand, six hundred forty-eight".