634969810945 has 4 divisors (see below), whose sum is σ = 761963773140. Its totient is φ = 507975848752.

The previous prime is 634969810901. The next prime is 634969811027. The reversal of 634969810945 is 549018969436.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118733308929 + 516236502016 = 344577^2 + 718496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634969810945 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63496981090 + ... + 63496981099.

It is an arithmetic number, because the mean of its divisors is an integer number (190490943285).

Almost surely, 2^634969810945 is an apocalyptic number.

It is an amenable number.

634969810945 is a deficient number, since it is larger than the sum of its proper divisors (126993962195).

634969810945 is a wasteful number, since it uses less digits than its factorization.

634969810945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126993962194.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 634969810945 in words is "six hundred thirty-four billion, nine hundred sixty-nine million, eight hundred ten thousand, nine hundred forty-five".