11155947550 has 24 divisors (see below), whose sum is σ = 22636432872. Its totient is φ = 4056708000.

The previous prime is 11155947547. The next prime is 11155947557. The reversal of 11155947550 is 5574955111.

It is a junction number, because it is equal to n+sod(n) for n = 11155947497 and 11155947506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155947557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10141221 + ... + 10142320.

It is an arithmetic number, because the mean of its divisors is an integer number (943184703).

Almost surely, 2^11155947550 is an apocalyptic number.

11155947550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11155947550 is an abundant number, since it is smaller than the sum of its proper divisors (11480485322).

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

11155947550 is a wasteful number, since it uses less digits than its factorization.

11155947550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20283564 (or 20283559 counting only the distinct ones).

The product of its (nonzero) digits is 157500, while the sum is 43.

The spelling of 11155947550 in words is "eleven billion, one hundred fifty-five million, nine hundred forty-seven thousand, five hundred fifty".