208728053609 has 2 divisors, whose sum is σ = 208728053610. Its totient is φ = 208728053608.

The previous prime is 208728053603. The next prime is 208728053629. The reversal of 208728053609 is 906350827802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195364000000 + 13364053609 = 442000^2 + 115603^2 .

It is a cyclic number.

It is not a de Polignac number, because 208728053609 - 2¹² = 208728049513 is a prime.

It is not a weakly prime, because it can be changed into another prime (208728053603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104364026804 + 104364026805.

It is an arithmetic number, because the mean of its divisors is an integer number (104364026805).

Almost surely, 2^208728053609 is an apocalyptic number.

It is an amenable number.

208728053609 is a deficient number, since it is larger than the sum of its proper divisors (1).

208728053609 is an equidigital number, since it uses as much as digits as its factorization.

208728053609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 208728053609 in words is "two hundred eight billion, seven hundred twenty-eight million, fifty-three thousand, six hundred nine".