40520426809 has 2 divisors, whose sum is σ = 40520426810. Its totient is φ = 40520426808.

The previous prime is 40520426803. The next prime is 40520426839. The reversal of 40520426809 is 90862402504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36101900025 + 4418526784 = 190005^2 + 66472^2 .

It is a cyclic number.

It is not a de Polignac number, because 40520426809 - 2¹¹ = 40520424761 is a prime.

It is not a weakly prime, because it can be changed into another prime (40520426803) 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, 20260213404 + 20260213405.

It is an arithmetic number, because the mean of its divisors is an integer number (20260213405).

Almost surely, 2^40520426809 is an apocalyptic number.

It is an amenable number.

40520426809 is a deficient number, since it is larger than the sum of its proper divisors (1).

40520426809 is an equidigital number, since it uses as much as digits as its factorization.

40520426809 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 40.

The spelling of 40520426809 in words is "forty billion, five hundred twenty million, four hundred twenty-six thousand, eight hundred nine".