6556851665 has 32 divisors (see below), whose sum is σ = 9722716416. Its totient is φ = 4133664000.

The previous prime is 6556851577. The next prime is 6556851671. The reversal of 6556851665 is 5661586556.

It is a de Polignac number, because none of the positive numbers 2^k-6556851665 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85499 + ... + 142911.

It is an arithmetic number, because the mean of its divisors is an integer number (303834888).

Almost surely, 2^6556851665 is an apocalyptic number.

6556851665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6556851665 is a deficient number, since it is larger than the sum of its proper divisors (3165864751).

6556851665 is a wasteful number, since it uses less digits than its factorization.

6556851665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57689.

The product of its digits is 6480000, while the sum is 53.

The square root of 6556851665 is about 80974.3889449003. The cubic root of 6556851665 is about 1871.6808040862.

The spelling of 6556851665 in words is "six billion, five hundred fifty-six million, eight hundred fifty-one thousand, six hundred sixty-five".