40868918593 has 2 divisors, whose sum is σ = 40868918594. Its totient is φ = 40868918592.

The previous prime is 40868918591. The next prime is 40868918609. The reversal of 40868918593 is 39581986804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20884007169 + 19984911424 = 144513^2 + 141368^2 .

It is a cyclic number.

It is not a de Polignac number, because 40868918593 - 2¹ = 40868918591 is a prime.

It is a super-2 number, since 2×40868918593² (a number of 22 digits) contains 22 as substring.

Together with 40868918591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40868918591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20434459296 + 20434459297.

It is an arithmetic number, because the mean of its divisors is an integer number (20434459297).

Almost surely, 2^40868918593 is an apocalyptic number.

It is an amenable number.

40868918593 is a deficient number, since it is larger than the sum of its proper divisors (1).

40868918593 is an equidigital number, since it uses as much as digits as its factorization.

40868918593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 40868918593 in words is "forty billion, eight hundred sixty-eight million, nine hundred eighteen thousand, five hundred ninety-three".