43125576661 has 2 divisors, whose sum is σ = 43125576662. Its totient is φ = 43125576660.

The previous prime is 43125576583. The next prime is 43125576673. The reversal of 43125576661 is 16667552134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29437980625 + 13687596036 = 171575^2 + 116994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43125576661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43125576691) 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 as a sum of consecutive naturals, namely, 21562788330 + 21562788331.

It is an arithmetic number, because the mean of its divisors is an integer number (21562788331).

Almost surely, 2^43125576661 is an apocalyptic number.

It is an amenable number.

43125576661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43125576661 is an equidigital number, since it uses as much as digits as its factorization.

43125576661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 46.

The spelling of 43125576661 in words is "forty-three billion, one hundred twenty-five million, five hundred seventy-six thousand, six hundred sixty-one".