40043144549 has 2 divisors, whose sum is σ = 40043144550. Its totient is φ = 40043144548.

The previous prime is 40043144539. The next prime is 40043144563. The reversal of 40043144549 is 94544134004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30065132449 + 9978012100 = 173393^2 + 99890^2 .

It is a cyclic number.

It is not a de Polignac number, because 40043144549 - 2⁸ = 40043144293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40043144539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021572274 + 20021572275.

It is an arithmetic number, because the mean of its divisors is an integer number (20021572275).

Almost surely, 2^40043144549 is an apocalyptic number.

It is an amenable number.

40043144549 is a deficient number, since it is larger than the sum of its proper divisors (1).

40043144549 is an equidigital number, since it uses as much as digits as its factorization.

40043144549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 40043144549 in words is "forty billion, forty-three million, one hundred forty-four thousand, five hundred forty-nine".