208742977697 has 16 divisors (see below), whose sum is σ = 226650493440. Its totient is φ = 191731755072.

The previous prime is 208742977693. The next prime is 208742977739. The reversal of 208742977697 is 796779247802.

It is not a de Polignac number, because 208742977697 - 2² = 208742977693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208742977693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1764422 + ... + 1879007.

It is an arithmetic number, because the mean of its divisors is an integer number (14165655840).

Almost surely, 2^208742977697 is an apocalyptic number.

It is an amenable number.

208742977697 is a deficient number, since it is larger than the sum of its proper divisors (17907515743).

208742977697 is a wasteful number, since it uses less digits than its factorization.

208742977697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643552.

The product of its (nonzero) digits is 149361408, while the sum is 68.

The spelling of 208742977697 in words is "two hundred eight billion, seven hundred forty-two million, nine hundred seventy-seven thousand, six hundred ninety-seven".