7955838221857 has 2 divisors, whose sum is σ = 7955838221858. Its totient is φ = 7955838221856.

The previous prime is 7955838221813. The next prime is 7955838221909. The reversal of 7955838221857 is 7581228385597.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3996836625681 + 3959001596176 = 1999209^2 + 1989724^2 .

It is a cyclic number.

It is not a de Polignac number, because 7955838221857 - 2⁷ = 7955838221729 is a prime.

It is not a weakly prime, because it can be changed into another prime (7955835221857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3977919110928 + 3977919110929.

It is an arithmetic number, because the mean of its divisors is an integer number (3977919110929).

Almost surely, 2^{7955838221857} is an apocalyptic number.

It is an amenable number.

7955838221857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7955838221857 is an equidigital number, since it uses as much as digits as its factorization.

7955838221857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688000, while the sum is 70.

The spelling of 7955838221857 in words is "seven trillion, nine hundred fifty-five billion, eight hundred thirty-eight million, two hundred twenty-one thousand, eight hundred fifty-seven".