11555455420 has 48 divisors (see below), whose sum is σ = 25248555360. Its totient is φ = 4436961536.

The previous prime is 11555455411. The next prime is 11555455427. The reversal of 11555455420 is 2455455511.

It is a self number, because there is not a number n which added to its sum of digits gives 11555455420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555455427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42759 + ... + 157921.

It is an arithmetic number, because the mean of its divisors is an integer number (526011570).

Almost surely, 2^11555455420 is an apocalyptic number.

11555455420 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 11555455420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12624277680).

11555455420 is an abundant number, since it is smaller than the sum of its proper divisors (13693099940).

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

11555455420 is a wasteful number, since it uses less digits than its factorization.

11555455420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115374 (or 115372 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 37.

Subtracting from 11555455420 its reverse (2455455511), we obtain a palindrome (9099999909).

The spelling of 11555455420 in words is "eleven billion, five hundred fifty-five million, four hundred fifty-five thousand, four hundred twenty".