63857605813 has 2 divisors, whose sum is σ = 63857605814. Its totient is φ = 63857605812.

The previous prime is 63857605793. The next prime is 63857605831. The reversal of 63857605813 is 31850675836.

Together with next prime (63857605831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33634826404 + 30222779409 = 183398^2 + 173847^2 .

It is a cyclic number.

It is not a de Polignac number, because 63857605813 - 2⁵ = 63857605781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63857605213) 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, 31928802906 + 31928802907.

It is an arithmetic number, because the mean of its divisors is an integer number (31928802907).

Almost surely, 2^63857605813 is an apocalyptic number.

It is an amenable number.

63857605813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63857605813 is an equidigital number, since it uses as much as digits as its factorization.

63857605813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 63857605813 in words is "sixty-three billion, eight hundred fifty-seven million, six hundred five thousand, eight hundred thirteen".