620664853 has 2 divisors, whose sum is σ = 620664854. Its totient is φ = 620664852.

The previous prime is 620664767. The next prime is 620664859. The reversal of 620664853 is 358466026.

It is a happy number.

620664853 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., 451222564 + 169442289 = 21242^2 + 13017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620664853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620664859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310332426 + 310332427.

It is an arithmetic number, because the mean of its divisors is an integer number (310332427).

Almost surely, 2^620664853 is an apocalyptic number.

It is an amenable number.

620664853 is a deficient number, since it is larger than the sum of its proper divisors (1).

620664853 is an equidigital number, since it uses as much as digits as its factorization.

620664853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 620664853 is about 24913.1461883079. The cubic root of 620664853 is about 853.0065859040.

The spelling of 620664853 in words is "six hundred twenty million, six hundred sixty-four thousand, eight hundred fifty-three".