208664777939 has 8 divisors (see below), whose sum is σ = 216361807872. Its totient is φ = 201028117320.

The previous prime is 208664777933. The next prime is 208664777947. The reversal of 208664777939 is 939777466802.

208664777939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208664777939 - 2²⁰ = 208663729363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208664777933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15085289 + ... + 15099114.

It is an arithmetic number, because the mean of its divisors is an integer number (27045225984).

Almost surely, 2^208664777939 is an apocalyptic number.

208664777939 is a deficient number, since it is larger than the sum of its proper divisors (7697029933).

208664777939 is a wasteful number, since it uses less digits than its factorization.

208664777939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30184657.

The product of its (nonzero) digits is 192036096, while the sum is 68.

The spelling of 208664777939 in words is "two hundred eight billion, six hundred sixty-four million, seven hundred seventy-seven thousand, nine hundred thirty-nine".