208104502992649 has 2 divisors, whose sum is σ = 208104502992650. Its totient is φ = 208104502992648.

The previous prime is 208104502992637. The next prime is 208104502992679. The reversal of 208104502992649 is 946299205401802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197925646646025 + 10178856346624 = 14068605^2 + 3190432^2 .

It is a cyclic number.

It is not a de Polignac number, because 208104502992649 - 2⁹ = 208104502992137 is a prime.

It is not a weakly prime, because it can be changed into another prime (208104502992679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104052251496324 + 104052251496325.

It is an arithmetic number, because the mean of its divisors is an integer number (104052251496325).

Almost surely, 2^{208104502992649} is an apocalyptic number.

It is an amenable number.

208104502992649 is a deficient number, since it is larger than the sum of its proper divisors (1).

208104502992649 is an equidigital number, since it uses as much as digits as its factorization.

208104502992649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 208104502992649 in words is "two hundred eight trillion, one hundred four billion, five hundred two million, nine hundred ninety-two thousand, six hundred forty-nine".