1078158211717 has 2 divisors, whose sum is σ = 1078158211718. Its totient is φ = 1078158211716.

The previous prime is 1078158211661. The next prime is 1078158211721. The reversal of 1078158211717 is 7171128518701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1012420328481 + 65737883236 = 1006191^2 + 256394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1078158211717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1078158241717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539079105858 + 539079105859.

It is an arithmetic number, because the mean of its divisors is an integer number (539079105859).

Almost surely, 2^{1078158211717} is an apocalyptic number.

It is an amenable number.

1078158211717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078158211717 is an equidigital number, since it uses as much as digits as its factorization.

1078158211717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 219520, while the sum is 49.

The spelling of 1078158211717 in words is "one trillion, seventy-eight billion, one hundred fifty-eight million, two hundred eleven thousand, seven hundred seventeen".