204921035555897 has 2 divisors, whose sum is σ = 204921035555898. Its totient is φ = 204921035555896.

The previous prime is 204921035555869. The next prime is 204921035555947. The reversal of 204921035555897 is 798555530129402.

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., 144827361011776 + 60093674544121 = 12034424^2 + 7752011^2 .

It is a cyclic number.

It is not a de Polignac number, because 204921035555897 - 2⁶ = 204921035555833 is a prime.

It is a super-2 number, since 2×204921035555897² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204921035555597) 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, 102460517777948 + 102460517777949.

It is an arithmetic number, because the mean of its divisors is an integer number (102460517777949).

Almost surely, 2^{204921035555897} is an apocalyptic number.

It is an amenable number.

204921035555897 is a deficient number, since it is larger than the sum of its proper divisors (1).

204921035555897 is an equidigital number, since it uses as much as digits as its factorization.

204921035555897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080000, while the sum is 65.

The spelling of 204921035555897 in words is "two hundred four trillion, nine hundred twenty-one billion, thirty-five million, five hundred fifty-five thousand, eight hundred ninety-seven".