204181682197 has 2 divisors, whose sum is σ = 204181682198. Its totient is φ = 204181682196.

The previous prime is 204181682129. The next prime is 204181682203. The reversal of 204181682197 is 791286181402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199910928996 + 4270753201 = 447114^2 + 65351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204181682197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204181682197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204181682297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102090841098 + 102090841099.

It is an arithmetic number, because the mean of its divisors is an integer number (102090841099).

Almost surely, 2^204181682197 is an apocalyptic number.

It is an amenable number.

204181682197 is a deficient number, since it is larger than the sum of its proper divisors (1).

204181682197 is an equidigital number, since it uses as much as digits as its factorization.

204181682197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 204181682197 in words is "two hundred four billion, one hundred eighty-one million, six hundred eighty-two thousand, one hundred ninety-seven".