620172650621257 has 2 divisors, whose sum is σ = 620172650621258. Its totient is φ = 620172650621256.

The previous prime is 620172650621221. The next prime is 620172650621323. The reversal of 620172650621257 is 752126056271026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394697530064016 + 225475120557241 = 19866996^2 + 15015829^2 .

It is a cyclic number.

It is not a de Polignac number, because 620172650621257 - 2³¹ = 620170503137609 is a prime.

It is a super-2 number, since 2×620172650621257² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (620172650621057) 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, 310086325310628 + 310086325310629.

It is an arithmetic number, because the mean of its divisors is an integer number (310086325310629).

Almost surely, 2^{620172650621257} is an apocalyptic number.

It is an amenable number.

620172650621257 is a deficient number, since it is larger than the sum of its proper divisors (1).

620172650621257 is an equidigital number, since it uses as much as digits as its factorization.

620172650621257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 620172650621257 in words is "six hundred twenty trillion, one hundred seventy-two billion, six hundred fifty million, six hundred twenty-one thousand, two hundred fifty-seven".