208868614639 has 16 divisors (see below), whose sum is σ = 224804724480. Its totient is φ = 193475969280.

The previous prime is 208868614637. The next prime is 208868614681. The reversal of 208868614639 is 936416868802.

It is a cyclic number.

It is not a de Polignac number, because 208868614639 - 2¹ = 208868614637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208868614631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529747 + ... + 835684.

It is an arithmetic number, because the mean of its divisors is an integer number (14050295280).

Almost surely, 2^208868614639 is an apocalyptic number.

208868614639 is a deficient number, since it is larger than the sum of its proper divisors (15936109841).

208868614639 is a wasteful number, since it uses less digits than its factorization.

208868614639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365630.

The product of its (nonzero) digits is 23887872, while the sum is 61.

The spelling of 208868614639 in words is "two hundred eight billion, eight hundred sixty-eight million, six hundred fourteen thousand, six hundred thirty-nine".