634857860393 has 2 divisors, whose sum is σ = 634857860394. Its totient is φ = 634857860392.

The previous prime is 634857860363. The next prime is 634857860407. The reversal of 634857860393 is 393068758436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560442385129 + 74415475264 = 748627^2 + 272792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634857860393 is a prime.

It is a super-2 number, since 2×634857860393² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (634857860363) 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, 317428930196 + 317428930197.

It is an arithmetic number, because the mean of its divisors is an integer number (317428930197).

Almost surely, 2^634857860393 is an apocalyptic number.

It is an amenable number.

634857860393 is a deficient number, since it is larger than the sum of its proper divisors (1).

634857860393 is an equidigital number, since it uses as much as digits as its factorization.

634857860393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 634857860393 in words is "six hundred thirty-four billion, eight hundred fifty-seven million, eight hundred sixty thousand, three hundred ninety-three".