6566655011557 has 4 divisors (see below), whose sum is σ = 6566677147360. Its totient is φ = 6566632875756.

The previous prime is 6566655011509. The next prime is 6566655011569. The reversal of 6566655011557 is 7551105566656.

It is a happy number.

6566655011557 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6566655011557 - 2¹⁵ = 6566654978789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566655021557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10616793 + ... + 11218270.

It is an arithmetic number, because the mean of its divisors is an integer number (1641669286840).

Almost surely, 2^{6566655011557} is an apocalyptic number.

It is an amenable number.

6566655011557 is a deficient number, since it is larger than the sum of its proper divisors (22135803).

6566655011557 is a wasteful number, since it uses less digits than its factorization.

6566655011557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22135802.

The product of its (nonzero) digits is 28350000, while the sum is 58.

The spelling of 6566655011557 in words is "six trillion, five hundred sixty-six billion, six hundred fifty-five million, eleven thousand, five hundred fifty-seven".