208668641 has 4 divisors (see below), whose sum is σ = 214308372. Its totient is φ = 203028912.

The previous prime is 208668623. The next prime is 208668643. The reversal of 208668641 is 146866802.

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 145926400 + 62742241 = 12080^2 + 7921^2 .

It is a cyclic number.

It is not a de Polignac number, because 208668641 - 2²² = 204474337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208668643) 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, 2819810 + ... + 2819883.

It is an arithmetic number, because the mean of its divisors is an integer number (53577093).

Almost surely, 2^208668641 is an apocalyptic number.

It is an amenable number.

208668641 is a deficient number, since it is larger than the sum of its proper divisors (5639731).

208668641 is an equidigital number, since it uses as much as digits as its factorization.

208668641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639730.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 208668641 is about 14445.3674581161. The cubic root of 208668641 is about 593.1334212328.

The spelling of 208668641 in words is "two hundred eight million, six hundred sixty-eight thousand, six hundred forty-one".