11550555101550 has 96 divisors (see below), whose sum is σ = 28798128801792. Its totient is φ = 3063748135680.

The previous prime is 11550555101531. The next prime is 11550555101567. The reversal of 11550555101550 is 5510155505511.

It is a junction number, because it is equal to n+sod(n) for n = 11550555101499 and 11550555101508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36856314 + ... + 37168386.

It is an arithmetic number, because the mean of its divisors is an integer number (299980508352).

Almost surely, 2^{11550555101550} is an apocalyptic number.

11550555101550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11550555101550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14399064400896).

11550555101550 is an abundant number, since it is smaller than the sum of its proper divisors (17247573700242).

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

11550555101550 is a wasteful number, since it uses less digits than its factorization.

11550555101550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313402 (or 313397 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 39.

The spelling of 11550555101550 in words is "eleven trillion, five hundred fifty billion, five hundred fifty-five million, one hundred one thousand, five hundred fifty".