638584860553 has 16 divisors (see below), whose sum is σ = 645085115136. Its totient is φ = 632119340880.

The previous prime is 638584860539. The next prime is 638584860607. The reversal of 638584860553 is 355068485836.

It is a cyclic number.

It is not a de Polignac number, because 638584860553 - 2⁵ = 638584860521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638584860491 and 638584860500.

It is not an unprimeable number, because it can be changed into a prime (638584860853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78610350 + ... + 78618472.

It is an arithmetic number, because the mean of its divisors is an integer number (40317819696).

Almost surely, 2^638584860553 is an apocalyptic number.

It is an amenable number.

638584860553 is a deficient number, since it is larger than the sum of its proper divisors (6500254583).

638584860553 is a wasteful number, since it uses less digits than its factorization.

638584860553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10164.

The product of its (nonzero) digits is 82944000, while the sum is 61.

The spelling of 638584860553 in words is "six hundred thirty-eight billion, five hundred eighty-four million, eight hundred sixty thousand, five hundred fifty-three".