43520081643 has 12 divisors (see below), whose sum is σ = 63188054280. Its totient is φ = 28863058176.

The previous prime is 43520081641. The next prime is 43520081653. The reversal of 43520081643 is 34618002534.

43520081643 is a `hidden beast` number, since 4 + 3 + 5 + 2 + 0 + 0 + 8 + 1 + 643 = 666.

It is not a de Polignac number, because 43520081643 - 2¹ = 43520081641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43520081598 and 43520081607.

It is not an unprimeable number, because it can be changed into a prime (43520081641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12525633 + ... + 12529106.

It is an arithmetic number, because the mean of its divisors is an integer number (5265671190).

Almost surely, 2^43520081643 is an apocalyptic number.

43520081643 is a deficient number, since it is larger than the sum of its proper divisors (19667972637).

43520081643 is a wasteful number, since it uses less digits than its factorization.

43520081643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25054938 (or 25054935 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 43520081643 in words is "forty-three billion, five hundred twenty million, eighty-one thousand, six hundred forty-three".