11555510166165 has 48 divisors (see below), whose sum is σ = 21510262400832. Its totient is φ = 5281815522816.

The previous prime is 11555510166139. The next prime is 11555510166181. The reversal of 11555510166165 is 56166101555511.

It is not a de Polignac number, because 11555510166165 - 2⁵ = 11555510166133 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4496722 + ... + 6582668.

It is an arithmetic number, because the mean of its divisors is an integer number (448130466684).

Almost surely, 2^{11555510166165} is an apocalyptic number.

11555510166165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11555510166165 is a deficient number, since it is larger than the sum of its proper divisors (9954752234667).

11555510166165 is a wasteful number, since it uses less digits than its factorization.

11555510166165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093506 (or 2093499 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 48.

The spelling of 11555510166165 in words is "eleven trillion, five hundred fifty-five billion, five hundred ten million, one hundred sixty-six thousand, one hundred sixty-five".