43055516521 has 4 divisors (see below), whose sum is σ = 43340652544. Its totient is φ = 42770380500.

The previous prime is 43055516501. The next prime is 43055516527. The reversal of 43055516521 is 12561555034.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43055516521 - 2¹⁵ = 43055483753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43055516527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142567785 + ... + 142568086.

It is an arithmetic number, because the mean of its divisors is an integer number (10835163136).

Almost surely, 2^43055516521 is an apocalyptic number.

It is an amenable number.

43055516521 is a deficient number, since it is larger than the sum of its proper divisors (285136023).

43055516521 is a wasteful number, since it uses less digits than its factorization.

43055516521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285136022.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 43055516521 in words is "forty-three billion, fifty-five million, five hundred sixteen thousand, five hundred twenty-one".