625606616453209 has 2 divisors, whose sum is σ = 625606616453210. Its totient is φ = 625606616453208.

The previous prime is 625606616453183. The next prime is 625606616453233. The reversal of 625606616453209 is 902354616606526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622844861059600 + 2761755393609 = 24956860^2 + 1661853^2 .

It is a cyclic number.

It is not a de Polignac number, because 625606616453209 - 2¹³ = 625606616445017 is a prime.

It is not a weakly prime, because it can be changed into another prime (625606616453249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312803308226604 + 312803308226605.

It is an arithmetic number, because the mean of its divisors is an integer number (312803308226605).

Almost surely, 2^{625606616453209} is an apocalyptic number.

It is an amenable number.

625606616453209 is a deficient number, since it is larger than the sum of its proper divisors (1).

625606616453209 is an equidigital number, since it uses as much as digits as its factorization.

625606616453209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83980800, while the sum is 61.

The spelling of 625606616453209 in words is "six hundred twenty-five trillion, six hundred six billion, six hundred sixteen million, four hundred fifty-three thousand, two hundred nine".