620808757577 has 2 divisors, whose sum is σ = 620808757578. Its totient is φ = 620808757576.

The previous prime is 620808757571. The next prime is 620808757579. The reversal of 620808757577 is 775757808026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500392123456 + 120416634121 = 707384^2 + 347011^2 .

It is a cyclic number.

It is not a de Polignac number, because 620808757577 - 2⁴ = 620808757561 is a prime.

Together with 620808757579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (620808757571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310404378788 + 310404378789.

It is an arithmetic number, because the mean of its divisors is an integer number (310404378789).

Almost surely, 2^620808757577 is an apocalyptic number.

It is an amenable number.

620808757577 is a deficient number, since it is larger than the sum of its proper divisors (1).

620808757577 is an equidigital number, since it uses as much as digits as its factorization.

620808757577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46099200, while the sum is 62.

The spelling of 620808757577 in words is "six hundred twenty billion, eight hundred eight million, seven hundred fifty-seven thousand, five hundred seventy-seven".