208858810028009 has 2 divisors, whose sum is σ = 208858810028010. Its totient is φ = 208858810028008.

The previous prime is 208858810028003. The next prime is 208858810028027. The reversal of 208858810028009 is 900820018858802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172432274034409 + 36426535993600 = 13131347^2 + 6035440^2 .

It is a cyclic number.

It is not a de Polignac number, because 208858810028009 - 2⁴⁰ = 207759298400233 is a prime.

It is not a weakly prime, because it can be changed into another prime (208858810028003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104429405014004 + 104429405014005.

It is an arithmetic number, because the mean of its divisors is an integer number (104429405014005).

Almost surely, 2^{208858810028009} is an apocalyptic number.

It is an amenable number.

208858810028009 is a deficient number, since it is larger than the sum of its proper divisors (1).

208858810028009 is an equidigital number, since it uses as much as digits as its factorization.

208858810028009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5898240, while the sum is 59.

The spelling of 208858810028009 in words is "two hundred eight trillion, eight hundred fifty-eight billion, eight hundred ten million, twenty-eight thousand, nine".