194887378717 has 2 divisors, whose sum is σ = 194887378718. Its totient is φ = 194887378716.

The previous prime is 194887378711. The next prime is 194887378729. The reversal of 194887378717 is 717873788491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180806945796 + 14080432921 = 425214^2 + 118661^2 .

It is a cyclic number.

It is not a de Polignac number, because 194887378717 - 2¹⁹ = 194886854429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194887378711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97443689358 + 97443689359.

It is an arithmetic number, because the mean of its divisors is an integer number (97443689359).

Almost surely, 2^194887378717 is an apocalyptic number.

It is an amenable number.

194887378717 is a deficient number, since it is larger than the sum of its proper divisors (1).

194887378717 is an equidigital number, since it uses as much as digits as its factorization.

194887378717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132765696, while the sum is 70.

The spelling of 194887378717 in words is "one hundred ninety-four billion, eight hundred eighty-seven million, three hundred seventy-eight thousand, seven hundred seventeen".