208623556513 has 2 divisors, whose sum is σ = 208623556514. Its totient is φ = 208623556512.

The previous prime is 208623556469. The next prime is 208623556517. The reversal of 208623556513 is 315655326802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185233830544 + 23389725969 = 430388^2 + 152937^2 .

It is a cyclic number.

It is not a de Polignac number, because 208623556513 - 2¹³ = 208623548321 is a prime.

It is not a weakly prime, because it can be changed into another prime (208623556517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104311778256 + 104311778257.

It is an arithmetic number, because the mean of its divisors is an integer number (104311778257).

Almost surely, 2^208623556513 is an apocalyptic number.

It is an amenable number.

208623556513 is a deficient number, since it is larger than the sum of its proper divisors (1).

208623556513 is an equidigital number, since it uses as much as digits as its factorization.

208623556513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 208623556513 in words is "two hundred eight billion, six hundred twenty-three million, five hundred fifty-six thousand, five hundred thirteen".