208532546687981 has 2 divisors, whose sum is σ = 208532546687982. Its totient is φ = 208532546687980.

The previous prime is 208532546687977. The next prime is 208532546688173. The reversal of 208532546687981 is 189786645235802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200361901755625 + 8170644932356 = 14154925^2 + 2858434^2 .

It is a cyclic number.

It is not a de Polignac number, because 208532546687981 - 2² = 208532546687977 is a prime.

It is a super-2 number, since 2×208532546687981² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 208532546687899 and 208532546687908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208532546687951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104266273343990 + 104266273343991.

It is an arithmetic number, because the mean of its divisors is an integer number (104266273343991).

It is a 1-persistent number, because it is pandigital, but 2⋅208532546687981 = 417065093375962 is not.

Almost surely, 2^{208532546687981} is an apocalyptic number.

It is an amenable number.

208532546687981 is a deficient number, since it is larger than the sum of its proper divisors (1).

208532546687981 is an equidigital number, since it uses as much as digits as its factorization.

208532546687981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1393459200, while the sum is 74.

The spelling of 208532546687981 in words is "two hundred eight trillion, five hundred thirty-two billion, five hundred forty-six million, six hundred eighty-seven thousand, nine hundred eighty-one".