204921035555869 has 2 divisors, whose sum is σ = 204921035555870. Its totient is φ = 204921035555868.

The previous prime is 204921035555833. The next prime is 204921035555897. The reversal of 204921035555869 is 968555530129402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200479036719844 + 4441998836025 = 14159062^2 + 2107605^2 .

It is a cyclic number.

It is not a de Polignac number, because 204921035555869 - 2¹³ = 204921035547677 is a prime.

It is a super-2 number, since 2×204921035555869² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204921035555869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204921035555809) 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, 102460517777934 + 102460517777935.

It is an arithmetic number, because the mean of its divisors is an integer number (102460517777935).

Almost surely, 2^{204921035555869} is an apocalyptic number.

It is an amenable number.

204921035555869 is a deficient number, since it is larger than the sum of its proper divisors (1).

204921035555869 is an equidigital number, since it uses as much as digits as its factorization.

204921035555869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640000, while the sum is 64.

The spelling of 204921035555869 in words is "two hundred four trillion, nine hundred twenty-one billion, thirty-five million, five hundred fifty-five thousand, eight hundred sixty-nine".