12155331744 has 60 divisors (see below), whose sum is σ = 35748500634. Its totient is φ = 4051776384.

The previous prime is 12155331743. The next prime is 12155331763. The reversal of 12155331744 is 44713355121.

12155331744 is a `hidden beast` number, since 1 + 2 + 1 + 553 + 31 + 74 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9553107600 + 2602224144 = 97740^2 + 51012^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12155331699 and 12155331708.

It is not an unprimeable number, because it can be changed into a prime (12155331743) 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 9 ways as a sum of consecutive naturals, for example, 2342187 + ... + 2347370.

Almost surely, 2^12155331744 is an apocalyptic number.

It is an amenable number.

12155331744 is an abundant number, since it is smaller than the sum of its proper divisors (23593168890).

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

12155331744 is an equidigital number, since it uses as much as digits as its factorization.

12155331744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689579 (or 4689562 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

Adding to 12155331744 its reverse (44713355121), we get a palindrome (56868686865).

The spelling of 12155331744 in words is "twelve billion, one hundred fifty-five million, three hundred thirty-one thousand, seven hundred forty-four".