208747866961 has 4 divisors (see below), whose sum is σ = 215946069300. Its totient is φ = 201549664624.

The previous prime is 208747866931. The next prime is 208747866967. The reversal of 208747866961 is 169668747802.

208747866961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123565607361 + 85182259600 = 351519^2 + 291860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208747866961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208747866893 and 208747866902.

It is not an unprimeable number, because it can be changed into a prime (208747866967) 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 3 ways as a sum of consecutive naturals, for example, 3599101126 + ... + 3599101183.

It is an arithmetic number, because the mean of its divisors is an integer number (53986517325).

Almost surely, 2^208747866961 is an apocalyptic number.

It is an amenable number.

208747866961 is a deficient number, since it is larger than the sum of its proper divisors (7198202339).

208747866961 is an equidigital number, since it uses as much as digits as its factorization.

208747866961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7198202338.

The product of its (nonzero) digits is 48771072, while the sum is 64.

The spelling of 208747866961 in words is "two hundred eight billion, seven hundred forty-seven million, eight hundred sixty-six thousand, nine hundred sixty-one".