40684304581 has 2 divisors, whose sum is σ = 40684304582. Its totient is φ = 40684304580.

The previous prime is 40684304569. The next prime is 40684304677. The reversal of 40684304581 is 18540348604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30777088356 + 9907216225 = 175434^2 + 99535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40684304581 is a prime.

It is a super-2 number, since 2×40684304581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40685304581) 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, 20342152290 + 20342152291.

It is an arithmetic number, because the mean of its divisors is an integer number (20342152291).

Almost surely, 2^40684304581 is an apocalyptic number.

It is an amenable number.

40684304581 is a deficient number, since it is larger than the sum of its proper divisors (1).

40684304581 is an equidigital number, since it uses as much as digits as its factorization.

40684304581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 40684304581 in words is "forty billion, six hundred eighty-four million, three hundred four thousand, five hundred eighty-one".