620644680109 has 2 divisors, whose sum is σ = 620644680110. Its totient is φ = 620644680108.

The previous prime is 620644680041. The next prime is 620644680121. The reversal of 620644680109 is 901086446026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547881236100 + 72763444009 = 740190^2 + 269747^2 .

It is a cyclic number.

It is not a de Polignac number, because 620644680109 - 2¹¹ = 620644678061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620644680179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310322340054 + 310322340055.

It is an arithmetic number, because the mean of its divisors is an integer number (310322340055).

Almost surely, 2^620644680109 is an apocalyptic number.

It is an amenable number.

620644680109 is a deficient number, since it is larger than the sum of its proper divisors (1).

620644680109 is an equidigital number, since it uses as much as digits as its factorization.

620644680109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 620644680109 in words is "six hundred twenty billion, six hundred forty-four million, six hundred eighty thousand, one hundred nine".