204909223573 has 2 divisors, whose sum is σ = 204909223574. Its totient is φ = 204909223572.

The previous prime is 204909223559. The next prime is 204909223577. The reversal of 204909223573 is 375322909402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204758965009 + 150258564 = 452503^2 + 12258^2 .

It is a cyclic number.

It is not a de Polignac number, because 204909223573 - 2²¹ = 204907126421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204909223577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102454611786 + 102454611787.

It is an arithmetic number, because the mean of its divisors is an integer number (102454611787).

Almost surely, 2^204909223573 is an apocalyptic number.

It is an amenable number.

204909223573 is a deficient number, since it is larger than the sum of its proper divisors (1).

204909223573 is an equidigital number, since it uses as much as digits as its factorization.

204909223573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 204909223573 in words is "two hundred four billion, nine hundred nine million, two hundred twenty-three thousand, five hundred seventy-three".