638115663587 has 8 divisors (see below), whose sum is σ = 646167817680. Its totient is φ = 630103471200.

The previous prime is 638115663569. The next prime is 638115663589. The reversal of 638115663587 is 785366511836.

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

It is a cyclic number.

It is not a de Polignac number, because 638115663587 - 2¹⁰ = 638115662563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638115663589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9958289 + ... + 10022162.

It is an arithmetic number, because the mean of its divisors is an integer number (80770977210).

Almost surely, 2^638115663587 is an apocalyptic number.

638115663587 is a deficient number, since it is larger than the sum of its proper divisors (8052154093).

638115663587 is a wasteful number, since it uses less digits than its factorization.

638115663587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19980853.

The product of its digits is 21772800, while the sum is 59.

The spelling of 638115663587 in words is "six hundred thirty-eight billion, one hundred fifteen million, six hundred sixty-three thousand, five hundred eighty-seven".