638580885635 has 96 divisors (see below), whose sum is σ = 988059244032. Its totient is φ = 384889605120.

The previous prime is 638580885629. The next prime is 638580885661. The reversal of 638580885635 is 536588085836.

It is not a de Polignac number, because 638580885635 - 2¹⁰ = 638580884611 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 85907879 + ... + 85915311.

It is an arithmetic number, because the mean of its divisors is an integer number (10292283792).

Almost surely, 2^638580885635 is an apocalyptic number.

638580885635 is a deficient number, since it is larger than the sum of its proper divisors (349478358397).

638580885635 is a wasteful number, since it uses less digits than its factorization.

638580885635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693 (or 7656 counting only the distinct ones).

The product of its (nonzero) digits is 165888000, while the sum is 65.

The spelling of 638580885635 in words is "six hundred thirty-eight billion, five hundred eighty million, eight hundred eighty-five thousand, six hundred thirty-five".