208241340985 has 4 divisors (see below), whose sum is σ = 249889609188. Its totient is φ = 166593072784.

The previous prime is 208241340961. The next prime is 208241341019. The reversal of 208241340985 is 589043142802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165412210681 + 42829130304 = 406709^2 + 206952^2 .

It is a cyclic number.

It is not a de Polignac number, because 208241340985 - 2⁵ = 208241340953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20824134094 + ... + 20824134103.

It is an arithmetic number, because the mean of its divisors is an integer number (62472402297).

Almost surely, 2^208241340985 is an apocalyptic number.

It is an amenable number.

208241340985 is a deficient number, since it is larger than the sum of its proper divisors (41648268203).

208241340985 is an equidigital number, since it uses as much as digits as its factorization.

208241340985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41648268202.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 208241340985 in words is "two hundred eight billion, two hundred forty-one million, three hundred forty thousand, nine hundred eighty-five".