11391551554680 has 256 divisors, whose sum is σ = 41431591756800. Its totient is φ = 2761070400000.

The previous prime is 11391551554667. The next prime is 11391551554681. The reversal of 11391551554680 is 8645515519311.

It is a happy number.

11391551554680 is a `hidden beast` number, since 1 + 1 + 3 + 9 + 1 + 5 + 5 + 1 + 554 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11391551554681) 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 63 ways as a sum of consecutive naturals, for example, 65264725 + ... + 65439035.

It is an arithmetic number, because the mean of its divisors is an integer number (161842155300).

Almost surely, 2^{11391551554680} is an apocalyptic number.

11391551554680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11391551554680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20715795878400).

11391551554680 is an abundant number, since it is smaller than the sum of its proper divisors (30040040202120).

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

11391551554680 is a wasteful number, since it uses less digits than its factorization.

11391551554680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179843 (or 179833 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 54.

The spelling of 11391551554680 in words is "eleven trillion, three hundred ninety-one billion, five hundred fifty-one million, five hundred fifty-four thousand, six hundred eighty".