11554564321551 has 8 divisors (see below), whose sum is σ = 15407719357824. Its totient is φ = 7702226083160.

The previous prime is 11554564321541. The next prime is 11554564321603. The reversal of 11554564321551 is 15512346545511.

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 11554564321551 - 2¹¹ = 11554564319503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11554564321551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11554564321541) 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, 204166461 + ... + 204223046.

It is an arithmetic number, because the mean of its divisors is an integer number (1925964919728).

Almost surely, 2^{11554564321551} is an apocalyptic number.

11554564321551 is a deficient number, since it is larger than the sum of its proper divisors (3853155036273).

11554564321551 is an equidigital number, since it uses as much as digits as its factorization.

11554564321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408398941.

The product of its digits is 1800000, while the sum is 48.

The spelling of 11554564321551 in words is "eleven trillion, five hundred fifty-four billion, five hundred sixty-four million, three hundred twenty-one thousand, five hundred fifty-one".