43128561771 has 12 divisors (see below), whose sum is σ = 62307158472. Its totient is φ = 28747598976.

The previous prime is 43128561769. The next prime is 43128561907. The reversal of 43128561771 is 17716582134.

43128561771 is a `hidden beast` number, since 4 + 3 + 1 + 28 + 5 + 617 + 7 + 1 = 666.

It is not a de Polignac number, because 43128561771 - 2¹ = 43128561769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43128561761) 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, 340326 + ... + 449531.

It is an arithmetic number, because the mean of its divisors is an integer number (5192263206).

Almost surely, 2^43128561771 is an apocalyptic number.

43128561771 is a deficient number, since it is larger than the sum of its proper divisors (19178596701).

43128561771 is a wasteful number, since it uses less digits than its factorization.

43128561771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795930 (or 795927 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 43128561771 in words is "forty-three billion, one hundred twenty-eight million, five hundred sixty-one thousand, seven hundred seventy-one".