40445173309 has 2 divisors, whose sum is σ = 40445173310. Its totient is φ = 40445173308.

The previous prime is 40445173273. The next prime is 40445173421. The reversal of 40445173309 is 90337154404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31089447684 + 9355725625 = 176322^2 + 96725^2 .

It is a cyclic number.

It is not a de Polignac number, because 40445173309 - 2⁹ = 40445172797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40445176309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222586654 + 20222586655.

It is an arithmetic number, because the mean of its divisors is an integer number (20222586655).

Almost surely, 2^40445173309 is an apocalyptic number.

It is an amenable number.

40445173309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40445173309 is an equidigital number, since it uses as much as digits as its factorization.

40445173309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 40445173309 in words is "forty billion, four hundred forty-five million, one hundred seventy-three thousand, three hundred nine".