40444343257 has 2 divisors, whose sum is σ = 40444343258. Its totient is φ = 40444343256.

The previous prime is 40444343189. The next prime is 40444343267. The reversal of 40444343257 is 75234344404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21834199696 + 18610143561 = 147764^2 + 136419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40444343257 is a prime.

It is not a weakly prime, because it can be changed into another prime (40444343267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222171628 + 20222171629.

It is an arithmetic number, because the mean of its divisors is an integer number (20222171629).

Almost surely, 2^40444343257 is an apocalyptic number.

It is an amenable number.

40444343257 is a deficient number, since it is larger than the sum of its proper divisors (1).

40444343257 is an equidigital number, since it uses as much as digits as its factorization.

40444343257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 40.

The spelling of 40444343257 in words is "forty billion, four hundred forty-four million, three hundred forty-three thousand, two hundred fifty-seven".