40668385717 has 2 divisors, whose sum is σ = 40668385718. Its totient is φ = 40668385716.

The previous prime is 40668385699. The next prime is 40668385787. The reversal of 40668385717 is 71758386604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37714028401 + 2954357316 = 194201^2 + 54354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40668385717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40668385787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20334192858 + 20334192859.

It is an arithmetic number, because the mean of its divisors is an integer number (20334192859).

Almost surely, 2^40668385717 is an apocalyptic number.

It is an amenable number.

40668385717 is a deficient number, since it is larger than the sum of its proper divisors (1).

40668385717 is an equidigital number, since it uses as much as digits as its factorization.

40668385717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 40668385717 in words is "forty billion, six hundred sixty-eight million, three hundred eighty-five thousand, seven hundred seventeen".