208866616883081 has 4 divisors (see below), whose sum is σ = 208867386067200. Its totient is φ = 208865847698964.

The previous prime is 208866616883027. The next prime is 208866616883153. The reversal of 208866616883081 is 180388616668802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208866616883081 is a prime.

It is a super-2 number, since 2×208866616883081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208866616882996 and 208866616883014.

It is not an unprimeable number, because it can be changed into a prime (208866616880081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384184601 + ... + 384727878.

It is an arithmetic number, because the mean of its divisors is an integer number (52216846516800).

Almost surely, 2^{208866616883081} is an apocalyptic number.

It is an amenable number.

208866616883081 is a deficient number, since it is larger than the sum of its proper divisors (769184119).

208866616883081 is an equidigital number, since it uses as much as digits as its factorization.

208866616883081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769184118.

The product of its (nonzero) digits is 254803968, while the sum is 71.

The spelling of 208866616883081 in words is "two hundred eight trillion, eight hundred sixty-six billion, six hundred sixteen million, eight hundred eighty-three thousand, eighty-one".