620185385221 has 2 divisors, whose sum is σ = 620185385222. Its totient is φ = 620185385220.

The previous prime is 620185385207. The next prime is 620185385227. The reversal of 620185385221 is 122583581026.

620185385221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461292264225 + 158893120996 = 679185^2 + 398614^2 .

It is a cyclic number.

It is not a de Polignac number, because 620185385221 - 2³¹ = 618037901573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620185385227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310092692610 + 310092692611.

It is an arithmetic number, because the mean of its divisors is an integer number (310092692611).

Almost surely, 2^620185385221 is an apocalyptic number.

It is an amenable number.

620185385221 is a deficient number, since it is larger than the sum of its proper divisors (1).

620185385221 is an equidigital number, since it uses as much as digits as its factorization.

620185385221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 620185385221 in words is "six hundred twenty billion, one hundred eighty-five million, three hundred eighty-five thousand, two hundred twenty-one".