208136136307 has 4 divisors (see below), whose sum is σ = 227057603256. Its totient is φ = 189214669360.

The previous prime is 208136136199. The next prime is 208136136347. The reversal of 208136136307 is 703631631802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208136136307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208136136307.

It is not an unprimeable number, because it can be changed into a prime (208136136347) 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, 9460733458 + ... + 9460733479.

It is an arithmetic number, because the mean of its divisors is an integer number (56764400814).

Almost surely, 2^208136136307 is an apocalyptic number.

208136136307 is a deficient number, since it is larger than the sum of its proper divisors (18921466949).

208136136307 is a wasteful number, since it uses less digits than its factorization.

208136136307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18921466948.

The product of its (nonzero) digits is 108864, while the sum is 40.

It can be divided in two parts, 208136 and 136307, that added together give a palindrome (344443).

The spelling of 208136136307 in words is "two hundred eight billion, one hundred thirty-six million, one hundred thirty-six thousand, three hundred seven".