204108387649 has 2 divisors, whose sum is σ = 204108387650. Its totient is φ = 204108387648.

The previous prime is 204108387641. The next prime is 204108387697. The reversal of 204108387649 is 946783801402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111672930625 + 92435457024 = 334175^2 + 304032^2 .

It is a cyclic number.

It is not a de Polignac number, because 204108387649 - 2³ = 204108387641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204108387596 and 204108387605.

It is not a weakly prime, because it can be changed into another prime (204108387641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102054193824 + 102054193825.

It is an arithmetic number, because the mean of its divisors is an integer number (102054193825).

Almost surely, 2^204108387649 is an apocalyptic number.

It is an amenable number.

204108387649 is a deficient number, since it is larger than the sum of its proper divisors (1).

204108387649 is an equidigital number, since it uses as much as digits as its factorization.

204108387649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 204108387649 in words is "two hundred four billion, one hundred eight million, three hundred eighty-seven thousand, six hundred forty-nine".