12120529644 has 72 divisors (see below), whose sum is σ = 32761598688. Its totient is φ = 3764851200.

The previous prime is 12120529643. The next prime is 12120529651. The reversal of 12120529644 is 44692502121.

It is a happy number.

12120529644 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 0 + 5 + 2 + 9 + 644 = 666.

12120529644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 12120529599 and 12120529608.

It is not an unprimeable number, because it can be changed into a prime (12120529643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36232 + ... + 159855.

It is an arithmetic number, because the mean of its divisors is an integer number (455022204).

Almost surely, 2^12120529644 is an apocalyptic number.

It is an amenable number.

12120529644 is an abundant number, since it is smaller than the sum of its proper divisors (20641069044).

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

12120529644 is a wasteful number, since it uses less digits than its factorization.

12120529644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196215 (or 196210 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 12120529644 in words is "twelve billion, one hundred twenty million, five hundred twenty-nine thousand, six hundred forty-four".