43500611561 has 16 divisors (see below), whose sum is σ = 48159702528. Its totient is φ = 38962598400.

The previous prime is 43500611507. The next prime is 43500611573. The reversal of 43500611561 is 16511600534.

43500611561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-43500611561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43500611591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146531 + ... + 329351.

It is an arithmetic number, because the mean of its divisors is an integer number (3009981408).

Almost surely, 2^43500611561 is an apocalyptic number.

It is an amenable number.

43500611561 is a deficient number, since it is larger than the sum of its proper divisors (4659090967).

43500611561 is a wasteful number, since it uses less digits than its factorization.

43500611561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183152.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 43500611561 in words is "forty-three billion, five hundred million, six hundred eleven thousand, five hundred sixty-one".