205355102489 has 2 divisors, whose sum is σ = 205355102490. Its totient is φ = 205355102488.

The previous prime is 205355102467. The next prime is 205355102531. The reversal of 205355102489 is 984201553502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203870310400 + 1484792089 = 451520^2 + 38533^2 .

It is a cyclic number.

It is not a de Polignac number, because 205355102489 - 2¹² = 205355098393 is a prime.

It is not a weakly prime, because it can be changed into another prime (205355105489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102677551244 + 102677551245.

It is an arithmetic number, because the mean of its divisors is an integer number (102677551245).

Almost surely, 2^205355102489 is an apocalyptic number.

It is an amenable number.

205355102489 is a deficient number, since it is larger than the sum of its proper divisors (1).

205355102489 is an equidigital number, since it uses as much as digits as its factorization.

205355102489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 205355102489 in words is "two hundred five billion, three hundred fifty-five million, one hundred two thousand, four hundred eighty-nine".