12120812640 has 72 divisors (see below), whose sum is σ = 41362278048. Its totient is φ = 3232216320.

The previous prime is 12120812551. The next prime is 12120812651. The reversal of 12120812640 is 4621802121.

12120812640 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 0 + 8 + 12 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4207176 + ... + 4210055.

It is an arithmetic number, because the mean of its divisors is an integer number (574476084).

Almost surely, 2^12120812640 is an apocalyptic number.

12120812640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120812640 is an abundant number, since it is smaller than the sum of its proper divisors (29241465408).

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

12120812640 is a wasteful number, since it uses less digits than its factorization.

12120812640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8417252 (or 8417241 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 12120812640 in words is "twelve billion, one hundred twenty million, eight hundred twelve thousand, six hundred forty".