43564540889 has 2 divisors, whose sum is σ = 43564540890. Its totient is φ = 43564540888.

The previous prime is 43564540853. The next prime is 43564540927. The reversal of 43564540889 is 98804546534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38292619225 + 5271921664 = 195685^2 + 72608^2 .

It is a cyclic number.

It is not a de Polignac number, because 43564540889 - 2²⁴ = 43547763673 is a prime.

It is not a weakly prime, because it can be changed into another prime (43564540819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21782270444 + 21782270445.

It is an arithmetic number, because the mean of its divisors is an integer number (21782270445).

Almost surely, 2^43564540889 is an apocalyptic number.

It is an amenable number.

43564540889 is a deficient number, since it is larger than the sum of its proper divisors (1).

43564540889 is an equidigital number, since it uses as much as digits as its factorization.

43564540889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 43564540889 in words is "forty-three billion, five hundred sixty-four million, five hundred forty thousand, eight hundred eighty-nine".