634038685909 has 4 divisors (see below), whose sum is σ = 636691567680. Its totient is φ = 631385804140.

The previous prime is 634038685883. The next prime is 634038685919. The reversal of 634038685909 is 909586830436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634038685909 - 2¹³ = 634038677717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634038685919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1326440527 + ... + 1326441004.

It is an arithmetic number, because the mean of its divisors is an integer number (159172891920).

Almost surely, 2^634038685909 is an apocalyptic number.

It is an amenable number.

634038685909 is a deficient number, since it is larger than the sum of its proper divisors (2652881771).

634038685909 is a wasteful number, since it uses less digits than its factorization.

634038685909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652881770.

The product of its (nonzero) digits is 33592320, while the sum is 61.

The spelling of 634038685909 in words is "six hundred thirty-four billion, thirty-eight million, six hundred eighty-five thousand, nine hundred nine".