206415435649 has 2 divisors, whose sum is σ = 206415435650. Its totient is φ = 206415435648.

The previous prime is 206415435641. The next prime is 206415435727. The reversal of 206415435649 is 946534514602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183389497600 + 23025938049 = 428240^2 + 151743^2 .

It is a cyclic number.

It is not a de Polignac number, because 206415435649 - 2³ = 206415435641 is a prime.

It is not a weakly prime, because it can be changed into another prime (206415435641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103207717824 + 103207717825.

It is an arithmetic number, because the mean of its divisors is an integer number (103207717825).

Almost surely, 2^206415435649 is an apocalyptic number.

It is an amenable number.

206415435649 is a deficient number, since it is larger than the sum of its proper divisors (1).

206415435649 is an equidigital number, since it uses as much as digits as its factorization.

206415435649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 206415435649 in words is "two hundred six billion, four hundred fifteen million, four hundred thirty-five thousand, six hundred forty-nine".