6511165556556 has 12 divisors (see below), whose sum is σ = 15192719631992. Its totient is φ = 2170388518848.

The previous prime is 6511165556537. The next prime is 6511165556587. The reversal of 6511165556556 is 6556555611156.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×6511165556556² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6511165556496 and 6511165556505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271298564845 + ... + 271298564868.

Almost surely, 2^{6511165556556} is an apocalyptic number.

It is an amenable number.

6511165556556 is an abundant number, since it is smaller than the sum of its proper divisors (8681554075436).

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

6511165556556 is a wasteful number, since it uses less digits than its factorization.

6511165556556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542597129720 (or 542597129718 counting only the distinct ones).

The product of its digits is 20250000, while the sum is 57.

The spelling of 6511165556556 in words is "six trillion, five hundred eleven billion, one hundred sixty-five million, five hundred fifty-six thousand, five hundred fifty-six".