12155234445 has 24 divisors (see below), whose sum is σ = 21195248256. Its totient is φ = 6443968608.

The previous prime is 12155234437. The next prime is 12155234449. The reversal of 12155234445 is 54443255121.

12155234445 is a `hidden beast` number, since 1 + 21 + 552 + 3 + 44 + 45 = 666.

It is not a de Polignac number, because 12155234445 - 2³ = 12155234437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155234449) 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 23 ways as a sum of consecutive naturals, for example, 801217 + ... + 816246.

It is an arithmetic number, because the mean of its divisors is an integer number (883135344).

Almost surely, 2^12155234445 is an apocalyptic number.

12155234445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12155234445 is a deficient number, since it is larger than the sum of its proper divisors (9040013811).

12155234445 is a wasteful number, since it uses less digits than its factorization.

12155234445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617641 (or 1617638 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 12155234445 its reverse (54443255121), we get a palindrome (66598489566).

The spelling of 12155234445 in words is "twelve billion, one hundred fifty-five million, two hundred thirty-four thousand, four hundred forty-five".