208402686673201 has 2 divisors, whose sum is σ = 208402686673202. Its totient is φ = 208402686673200.

The previous prime is 208402686673199. The next prime is 208402686673213. The reversal of 208402686673201 is 102376686204802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186895584792576 + 21507101880625 = 13670976^2 + 4637575^2 .

It is a cyclic number.

It is not a de Polignac number, because 208402686673201 - 2¹ = 208402686673199 is a prime.

Together with 208402686673199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208402686673261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104201343336600 + 104201343336601.

It is an arithmetic number, because the mean of its divisors is an integer number (104201343336601).

Almost surely, 2^{208402686673201} is an apocalyptic number.

It is an amenable number.

208402686673201 is a deficient number, since it is larger than the sum of its proper divisors (1).

208402686673201 is an equidigital number, since it uses as much as digits as its factorization.

208402686673201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 208402686673201 in words is "two hundred eight trillion, four hundred two billion, six hundred eighty-six million, six hundred seventy-three thousand, two hundred one".