11554656513221 has 8 divisors (see below), whose sum is σ = 11614625137560. Its totient is φ = 11494688919552.

The previous prime is 11554656513167. The next prime is 11554656513241. The reversal of 11554656513221 is 12231565645511.

It can be written as a sum of positive squares in 4 ways, for example, as 234890469025 + 11319766044196 = 484655^2 + 3364486^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11554656513221 - 2¹⁰ = 11554656512197 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 (11554656513241) 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, 34013021 + ... + 34351053.

It is an arithmetic number, because the mean of its divisors is an integer number (1451828142195).

Almost surely, 2^{11554656513221} is an apocalyptic number.

It is an amenable number.

11554656513221 is a deficient number, since it is larger than the sum of its proper divisors (59968624339).

11554656513221 is a wasteful number, since it uses less digits than its factorization.

11554656513221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515335.

The product of its digits is 1080000, while the sum is 47.

The spelling of 11554656513221 in words is "eleven trillion, five hundred fifty-four billion, six hundred fifty-six million, five hundred thirteen thousand, two hundred twenty-one".