197802174490117 has 2 divisors, whose sum is σ = 197802174490118. Its totient is φ = 197802174490116.

The previous prime is 197802174490051. The next prime is 197802174490169. The reversal of 197802174490117 is 711094471208791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193332506212836 + 4469668277281 = 13904406^2 + 2114159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197802174490117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197802174490717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98901087245058 + 98901087245059.

It is an arithmetic number, because the mean of its divisors is an integer number (98901087245059).

Almost surely, 2^{197802174490117} is an apocalyptic number.

It is an amenable number.

197802174490117 is a deficient number, since it is larger than the sum of its proper divisors (1).

197802174490117 is an equidigital number, since it uses as much as digits as its factorization.

197802174490117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7112448, while the sum is 61.

The spelling of 197802174490117 in words is "one hundred ninety-seven trillion, eight hundred two billion, one hundred seventy-four million, four hundred ninety thousand, one hundred seventeen".