634768608557 has 2 divisors, whose sum is σ = 634768608558. Its totient is φ = 634768608556.

The previous prime is 634768608499. The next prime is 634768608577. The reversal of 634768608557 is 755806867436.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526755156841 + 108013451716 = 725779^2 + 328654^2 .

It is a cyclic number.

It is not a de Polignac number, because 634768608557 - 2¹⁴ = 634768592173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634768608493 and 634768608502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634768608577) 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, 317384304278 + 317384304279.

It is an arithmetic number, because the mean of its divisors is an integer number (317384304279).

Almost surely, 2^634768608557 is an apocalyptic number.

It is an amenable number.

634768608557 is a deficient number, since it is larger than the sum of its proper divisors (1).

634768608557 is an equidigital number, since it uses as much as digits as its factorization.

634768608557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 203212800, while the sum is 65.

The spelling of 634768608557 in words is "six hundred thirty-four billion, seven hundred sixty-eight million, six hundred eight thousand, five hundred fifty-seven".