208106513261 has 8 divisors (see below), whose sum is σ = 215355349248. Its totient is φ = 200891160000.

The previous prime is 208106513203. The next prime is 208106513267. The reversal of 208106513261 is 162315601802.

208106513261 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 not a de Polignac number, because 208106513261 - 2¹⁸ = 208106251117 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 (208106513267) 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, 8358035 + ... + 8382896.

It is an arithmetic number, because the mean of its divisors is an integer number (26919418656).

Almost surely, 2^208106513261 is an apocalyptic number.

It is an amenable number.

208106513261 is a deficient number, since it is larger than the sum of its proper divisors (7248835987).

208106513261 is a wasteful number, since it uses less digits than its factorization.

208106513261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16741363.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 208106513261 in words is "two hundred eight billion, one hundred six million, five hundred thirteen thousand, two hundred sixty-one".