620210561989 has 2 divisors, whose sum is σ = 620210561990. Its totient is φ = 620210561988.

The previous prime is 620210561981. The next prime is 620210562061. The reversal of 620210561989 is 989165012026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585263250625 + 34947311364 = 765025^2 + 186942^2 .

It is a cyclic number.

It is not a de Polignac number, because 620210561989 - 2³ = 620210561981 is a prime.

It is a super-2 number, since 2×620210561989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620210561981) by changing a digit.

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 as a sum of consecutive naturals, namely, 310105280994 + 310105280995.

It is an arithmetic number, because the mean of its divisors is an integer number (310105280995).

Almost surely, 2^620210561989 is an apocalyptic number.

It is an amenable number.

620210561989 is a deficient number, since it is larger than the sum of its proper divisors (1).

620210561989 is an equidigital number, since it uses as much as digits as its factorization.

620210561989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 620210561989 in words is "six hundred twenty billion, two hundred ten million, five hundred sixty-one thousand, nine hundred eighty-nine".