43542751561 has 9 divisors (see below), whose sum is σ = 44179699693. Its totient is φ = 42914866540.

The previous prime is 43542751541. The next prime is 43542751639. The reversal of 43542751561 is 16515724534.

The square root of 43542751561 is 208669.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 43542751561 - 2⁷ = 43542751433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43542751541) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14814030 + ... + 14816968.

Almost surely, 2^43542751561 is an apocalyptic number.

43542751561 is the 208669-th square number.

43542751561 is the 104335-th centered octagonal number.

It is an amenable number.

43542751561 is a deficient number, since it is larger than the sum of its proper divisors (636948132).

43542751561 is an frugal number, since it uses more digits than its factorization.

43542751561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6020 (or 3010 counting only the distinct ones).

The product of its digits is 504000, while the sum is 43.

The spelling of 43542751561 in words is "forty-three billion, five hundred forty-two million, seven hundred fifty-one thousand, five hundred sixty-one".