12155584540 has 24 divisors (see below), whose sum is σ = 27847339632. Its totient is φ = 4420212480.

The previous prime is 12155584531. The next prime is 12155584547. The reversal of 12155584540 is 4548555121.

It is a junction number, because it is equal to n+sod(n) for n = 12155584493 and 12155584502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155584547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27626109 + ... + 27626548.

It is an arithmetic number, because the mean of its divisors is an integer number (1160305818).

Almost surely, 2^12155584540 is an apocalyptic number.

12155584540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155584540 is an abundant number, since it is smaller than the sum of its proper divisors (15691755092).

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

12155584540 is a wasteful number, since it uses less digits than its factorization.

12155584540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55252677 (or 55252675 counting only the distinct ones).

The product of its (nonzero) digits is 160000, while the sum is 40.

It can be divided in two parts, 12155 and 584540, that added together give a palindrome (596695).

The spelling of 12155584540 in words is "twelve billion, one hundred fifty-five million, five hundred eighty-four thousand, five hundred forty".