641127536639857 has 2 divisors, whose sum is σ = 641127536639858. Its totient is φ = 641127536639856.

The previous prime is 641127536639789. The next prime is 641127536640001. The reversal of 641127536639857 is 758936635721146.

641127536639857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641100425041521 + 27111598336 = 25319961^2 + 164656^2 .

It is a cyclic number.

It is not a de Polignac number, because 641127536639857 - 2³¹ = 641125389156209 is a prime.

It is a super-2 number, since 2×641127536639857² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641127536639857.

It is not a weakly prime, because it can be changed into another prime (641127536639257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320563768319928 + 320563768319929.

It is an arithmetic number, because the mean of its divisors is an integer number (320563768319929).

Almost surely, 2^{641127536639857} is an apocalyptic number.

It is an amenable number.

641127536639857 is a deficient number, since it is larger than the sum of its proper divisors (1).

641127536639857 is an equidigital number, since it uses as much as digits as its factorization.

641127536639857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1371686400, while the sum is 73.

The spelling of 641127536639857 in words is "six hundred forty-one trillion, one hundred twenty-seven billion, five hundred thirty-six million, six hundred thirty-nine thousand, eight hundred fifty-seven".