634813670609 has 2 divisors, whose sum is σ = 634813670610. Its totient is φ = 634813670608.

The previous prime is 634813670587. The next prime is 634813670677. The reversal of 634813670609 is 906076318436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 634802595025 + 11075584 = 796745^2 + 3328^2 .

It is a cyclic number.

It is not a de Polignac number, because 634813670609 - 2²⁰ = 634812622033 is a prime.

It is not a weakly prime, because it can be changed into another prime (634813670009) 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, 317406835304 + 317406835305.

It is an arithmetic number, because the mean of its divisors is an integer number (317406835305).

Almost surely, 2^634813670609 is an apocalyptic number.

It is an amenable number.

634813670609 is a deficient number, since it is larger than the sum of its proper divisors (1).

634813670609 is an equidigital number, since it uses as much as digits as its factorization.

634813670609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 634813670609 in words is "six hundred thirty-four billion, eight hundred thirteen million, six hundred seventy thousand, six hundred nine".