204690236917 has 2 divisors, whose sum is σ = 204690236918. Its totient is φ = 204690236916.

The previous prime is 204690236851. The next prime is 204690237079. The reversal of 204690236917 is 719632096402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186823637361 + 17866599556 = 432231^2 + 133666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204690236917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204690216917) 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, 102345118458 + 102345118459.

It is an arithmetic number, because the mean of its divisors is an integer number (102345118459).

Almost surely, 2^204690236917 is an apocalyptic number.

It is an amenable number.

204690236917 is a deficient number, since it is larger than the sum of its proper divisors (1).

204690236917 is an equidigital number, since it uses as much as digits as its factorization.

204690236917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 204690236917 in words is "two hundred four billion, six hundred ninety million, two hundred thirty-six thousand, nine hundred seventeen".