11555240505 has 8 divisors (see below), whose sum is σ = 18488384832. Its totient is φ = 6162794928.

The previous prime is 11555240441. The next prime is 11555240509. The reversal of 11555240505 is 50504255511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11555240505 - 2⁶ = 11555240441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11555240509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385174669 + ... + 385174698.

It is an arithmetic number, because the mean of its divisors is an integer number (2311048104).

Almost surely, 2^11555240505 is an apocalyptic number.

11555240505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11555240505 is a deficient number, since it is larger than the sum of its proper divisors (6933144327).

11555240505 is an equidigital number, since it uses as much as digits as its factorization.

11555240505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770349375.

The product of its (nonzero) digits is 25000, while the sum is 33.

The spelling of 11555240505 in words is "eleven billion, five hundred fifty-five million, two hundred forty thousand, five hundred five".