634021669643 has 4 divisors (see below), whose sum is σ = 644415467568. Its totient is φ = 623627871720.

The previous prime is 634021669577. The next prime is 634021669751. The reversal of 634021669643 is 346966120436.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 634021669643 - 2¹⁰ = 634021668619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634021669591 and 634021669600.

It is not an unprimeable number, because it can be changed into a prime (634021669243) 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, 5196898871 + ... + 5196898992.

It is an arithmetic number, because the mean of its divisors is an integer number (161103866892).

Almost surely, 2^634021669643 is an apocalyptic number.

634021669643 is a deficient number, since it is larger than the sum of its proper divisors (10393797925).

634021669643 is a wasteful number, since it uses less digits than its factorization.

634021669643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10393797924.

The product of its (nonzero) digits is 3359232, while the sum is 50.

The spelling of 634021669643 in words is "six hundred thirty-four billion, twenty-one million, six hundred sixty-nine thousand, six hundred forty-three".