43447894285561 has 2 divisors, whose sum is σ = 43447894285562. Its totient is φ = 43447894285560.

The previous prime is 43447894285531. The next prime is 43447894285643. The reversal of 43447894285561 is 16558249874434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43135418875536 + 312475410025 = 6567756^2 + 558995^2 .

It is a cyclic number.

It is not a de Polignac number, because 43447894285561 - 2³³ = 43439304350969 is a prime.

It is a super-2 number, since 2×43447894285561² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43447894285531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21723947142780 + 21723947142781.

It is an arithmetic number, because the mean of its divisors is an integer number (21723947142781).

Almost surely, 2^{43447894285561} is an apocalyptic number.

It is an amenable number.

43447894285561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43447894285561 is an equidigital number, since it uses as much as digits as its factorization.

43447894285561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 928972800, while the sum is 70.

The spelling of 43447894285561 in words is "forty-three trillion, four hundred forty-seven billion, eight hundred ninety-four million, two hundred eighty-five thousand, five hundred sixty-one".