1216655066671 has 24 divisors (see below), whose sum is σ = 1395794810592. Its totient is φ = 1057706496000.

The previous prime is 1216655066663. The next prime is 1216655066689. The reversal of 1216655066671 is 1766605566121.

It is not a de Polignac number, because 1216655066671 - 2³ = 1216655066663 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 (1216655066171) 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 23 ways as a sum of consecutive naturals, for example, 12019471 + ... + 12120271.

It is an arithmetic number, because the mean of its divisors is an integer number (58158117108).

Almost surely, 2^{1216655066671} is an apocalyptic number.

1216655066671 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1216655066671 is a deficient number, since it is larger than the sum of its proper divisors (179139743921).

1216655066671 is a wasteful number, since it uses less digits than its factorization.

1216655066671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105183 (or 105172 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

It can be divided in two parts, 12166550 and 66671, that added together give a palindrome (12233221).

The spelling of 1216655066671 in words is "one trillion, two hundred sixteen billion, six hundred fifty-five million, sixty-six thousand, six hundred seventy-one".