634071250861 has 2 divisors, whose sum is σ = 634071250862. Its totient is φ = 634071250860.

The previous prime is 634071250829. The next prime is 634071250921. The reversal of 634071250861 is 168052170436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 618244101225 + 15827149636 = 786285^2 + 125806^2 .

It is a cyclic number.

It is not a de Polignac number, because 634071250861 - 2⁵ = 634071250829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634071250801) 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, 317035625430 + 317035625431.

It is an arithmetic number, because the mean of its divisors is an integer number (317035625431).

Almost surely, 2^634071250861 is an apocalyptic number.

It is an amenable number.

634071250861 is a deficient number, since it is larger than the sum of its proper divisors (1).

634071250861 is an equidigital number, since it uses as much as digits as its factorization.

634071250861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 634071250861 in words is "six hundred thirty-four billion, seventy-one million, two hundred fifty thousand, eight hundred sixty-one".