40381613509 has 2 divisors, whose sum is σ = 40381613510. Its totient is φ = 40381613508.

The previous prime is 40381613491. The next prime is 40381613537. The reversal of 40381613509 is 90531618304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40364828100 + 16785409 = 200910^2 + 4097^2 .

It is a cyclic number.

It is not a de Polignac number, because 40381613509 - 2¹³ = 40381605317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40381613579) 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, 20190806754 + 20190806755.

It is an arithmetic number, because the mean of its divisors is an integer number (20190806755).

Almost surely, 2^40381613509 is an apocalyptic number.

It is an amenable number.

40381613509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40381613509 is an equidigital number, since it uses as much as digits as its factorization.

40381613509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 40381613509 in words is "forty billion, three hundred eighty-one million, six hundred thirteen thousand, five hundred nine".