43253145638820 has 72 divisors (see below), whose sum is σ = 141293609094456. Its totient is φ = 10646928156672.

The previous prime is 43253145638819. The next prime is 43253145638849. The reversal of 43253145638820 is 2883654135234.

43253145638820 is a `hidden beast` number, since 4 + 3 + 2 + 53 + 1 + 4 + 563 + 8 + 8 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20179907136 + 43232965731684 = 142056^2 + 6575178^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9242122797 + ... + 9242127476.

It is an arithmetic number, because the mean of its divisors is an integer number (1962411237423).

Almost surely, 2^{43253145638820} is an apocalyptic number.

It is an amenable number.

43253145638820 is an abundant number, since it is smaller than the sum of its proper divisors (98040463455636).

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

43253145638820 is a wasteful number, since it uses less digits than its factorization.

43253145638820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18484250301 (or 18484250296 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 54.

The spelling of 43253145638820 in words is "forty-three trillion, two hundred fifty-three billion, one hundred forty-five million, six hundred thirty-eight thousand, eight hundred twenty".