717120843853 has 2 divisors, whose sum is σ = 717120843854. Its totient is φ = 717120843852.

The previous prime is 717120843839. The next prime is 717120843863. The reversal of 717120843853 is 358348021717.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715179736489 + 1941107364 = 845683^2 + 44058^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-717120843853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 717120843797 and 717120843806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (717120843863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358560421926 + 358560421927.

It is an arithmetic number, because the mean of its divisors is an integer number (358560421927).

Almost surely, 2^717120843853 is an apocalyptic number.

It is an amenable number.

717120843853 is a deficient number, since it is larger than the sum of its proper divisors (1).

717120843853 is an equidigital number, since it uses as much as digits as its factorization.

717120843853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 717120843853 in words is "seven hundred seventeen billion, one hundred twenty million, eight hundred forty-three thousand, eight hundred fifty-three".