6556511126665 has 8 divisors (see below), whose sum is σ = 7891583182848. Its totient is φ = 5229362347440.

The previous prime is 6556511126663. The next prime is 6556511126687. The reversal of 6556511126665 is 5666211156556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6556511126665 - 2¹ = 6556511126663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556511126663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1980817417 + ... + 1980820726.

It is an arithmetic number, because the mean of its divisors is an integer number (986447897856).

Almost surely, 2^{6556511126665} is an apocalyptic number.

It is an amenable number.

6556511126665 is a deficient number, since it is larger than the sum of its proper divisors (1335072056183).

6556511126665 is a wasteful number, since it uses less digits than its factorization.

6556511126665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961638479.

The product of its digits is 9720000, while the sum is 55.

The spelling of 6556511126665 in words is "six trillion, five hundred fifty-six billion, five hundred eleven million, one hundred twenty-six thousand, six hundred sixty-five".