43320531561 has 16 divisors (see below), whose sum is σ = 58627080960. Its totient is φ = 28448858880.

The previous prime is 43320531491. The next prime is 43320531577. The reversal of 43320531561 is 16513502334.

It is not a de Polignac number, because 43320531561 - 2¹⁴ = 43320515177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43320533561) 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 in 15 ways as a sum of consecutive naturals, for example, 108450 + ... + 313691.

It is an arithmetic number, because the mean of its divisors is an integer number (3664192560).

Almost surely, 2^43320531561 is an apocalyptic number.

It is an amenable number.

43320531561 is a deficient number, since it is larger than the sum of its proper divisors (15306549399).

43320531561 is a wasteful number, since it uses less digits than its factorization.

43320531561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422656.

The product of its (nonzero) digits is 32400, while the sum is 33.

The spelling of 43320531561 in words is "forty-three billion, three hundred twenty million, five hundred thirty-one thousand, five hundred sixty-one".