40418917709 has 2 divisors, whose sum is σ = 40418917710. Its totient is φ = 40418917708.

The previous prime is 40418917703. The next prime is 40418917711. The reversal of 40418917709 is 90771981404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37904196100 + 2514721609 = 194690^2 + 50147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40418917709 is a prime.

Together with 40418917711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40418917703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20209458854 + 20209458855.

It is an arithmetic number, because the mean of its divisors is an integer number (20209458855).

Almost surely, 2^40418917709 is an apocalyptic number.

It is an amenable number.

40418917709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40418917709 is an equidigital number, since it uses as much as digits as its factorization.

40418917709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 40418917709 in words is "forty billion, four hundred eighteen million, nine hundred seventeen thousand, seven hundred nine".