6556686065 has 4 divisors (see below), whose sum is σ = 7868023284. Its totient is φ = 5245348848.

The previous prime is 6556686043. The next prime is 6556686083. The reversal of 6556686065 is 5606866556.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2220200161 + 4336485904 = 47119^2 + 65852^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556686065 - 2⁶ = 6556686001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6556685998 and 6556686016.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655668602 + ... + 655668611.

It is an arithmetic number, because the mean of its divisors is an integer number (1967005821).

Almost surely, 2^6556686065 is an apocalyptic number.

It is an amenable number.

6556686065 is a deficient number, since it is larger than the sum of its proper divisors (1311337219).

6556686065 is a wasteful number, since it uses less digits than its factorization.

6556686065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311337218.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The square root of 6556686065 is about 80973.3663929072. The cubic root of 6556686065 is about 1871.6650468821.

The spelling of 6556686065 in words is "six billion, five hundred fifty-six million, six hundred eighty-six thousand, sixty-five".