43845537106549 has 2 divisors, whose sum is σ = 43845537106550. Its totient is φ = 43845537106548.

The previous prime is 43845537106453. The next prime is 43845537106559. The reversal of 43845537106549 is 94560173554834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43779792556900 + 65744549649 = 6616630^2 + 256407^2 .

It is a cyclic number.

It is not a de Polignac number, because 43845537106549 - 2¹⁵ = 43845537073781 is a prime.

It is a super-3 number, since 3×43845537106549³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43845537106559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21922768553274 + 21922768553275.

It is an arithmetic number, because the mean of its divisors is an integer number (21922768553275).

Almost surely, 2^{43845537106549} is an apocalyptic number.

It is an amenable number.

43845537106549 is a deficient number, since it is larger than the sum of its proper divisors (1).

43845537106549 is an equidigital number, since it uses as much as digits as its factorization.

43845537106549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728000, while the sum is 64.

The spelling of 43845537106549 in words is "forty-three trillion, eight hundred forty-five billion, five hundred thirty-seven million, one hundred six thousand, five hundred forty-nine".