208979552309 has 16 divisors (see below), whose sum is σ = 230204950080. Its totient is φ = 188133788160.

The previous prime is 208979552279. The next prime is 208979552323. The reversal of 208979552309 is 903255979802.

It is a cyclic number.

It is not a de Polignac number, because 208979552309 - 2⁸ = 208979552053 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 (208979551309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286277 + ... + 707045.

It is an arithmetic number, because the mean of its divisors is an integer number (14387809380).

Almost surely, 2^208979552309 is an apocalyptic number.

It is an amenable number.

208979552309 is a deficient number, since it is larger than the sum of its proper divisors (21225397771).

208979552309 is a wasteful number, since it uses less digits than its factorization.

208979552309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421220.

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 208979552309 in words is "two hundred eight billion, nine hundred seventy-nine million, five hundred fifty-two thousand, three hundred nine".