638613635245 has 8 divisors (see below), whose sum is σ = 766367011584. Its totient is φ = 510870475344.

The previous prime is 638613635171. The next prime is 638613635279. The reversal of 638613635245 is 542536316836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638613635245 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638613635192 and 638613635201.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2415909 + ... + 2667178.

It is an arithmetic number, because the mean of its divisors is an integer number (95795876448).

Almost surely, 2^638613635245 is an apocalyptic number.

It is an amenable number.

638613635245 is a deficient number, since it is larger than the sum of its proper divisors (127753376339).

638613635245 is a wasteful number, since it uses less digits than its factorization.

638613635245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108219.

The product of its digits is 9331200, while the sum is 52.

The spelling of 638613635245 in words is "six hundred thirty-eight billion, six hundred thirteen million, six hundred thirty-five thousand, two hundred forty-five".