204101555197 has 2 divisors, whose sum is σ = 204101555198. Its totient is φ = 204101555196.

The previous prime is 204101555183. The next prime is 204101555323. The reversal of 204101555197 is 791555101402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125720594041 + 78380961156 = 354571^2 + 279966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204101555197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204101555137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102050777598 + 102050777599.

It is an arithmetic number, because the mean of its divisors is an integer number (102050777599).

Almost surely, 2^204101555197 is an apocalyptic number.

It is an amenable number.

204101555197 is a deficient number, since it is larger than the sum of its proper divisors (1).

204101555197 is an equidigital number, since it uses as much as digits as its factorization.

204101555197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 40.

Adding to 204101555197 its reverse (791555101402), we get a palindrome (995656656599).

The spelling of 204101555197 in words is "two hundred four billion, one hundred one million, five hundred fifty-five thousand, one hundred ninety-seven".