208146806685 has 72 divisors (see below), whose sum is σ = 387567446760. Its totient is φ = 103307010048.

The previous prime is 208146806671. The next prime is 208146806701. The reversal of 208146806685 is 586608641802.

208146806685 is a `hidden beast` number, since 20 + 81 + 468 + 0 + 6 + 6 + 85 = 666.

208146806685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 13544071641 + 194602735044 = 116379^2 + 441138^2 .

It is not a de Polignac number, because 208146806685 - 2⁴ = 208146806669 is a prime.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 1067529 + ... + 1247361.

It is an arithmetic number, because the mean of its divisors is an integer number (5382881205).

Almost surely, 2^208146806685 is an apocalyptic number.

It is an amenable number.

208146806685 is a deficient number, since it is larger than the sum of its proper divisors (179420640075).

208146806685 is a wasteful number, since it uses less digits than its factorization.

208146806685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179967 (or 179947 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 208146806685 in words is "two hundred eight billion, one hundred forty-six million, eight hundred six thousand, six hundred eighty-five".