638632560863 has 16 divisors (see below), whose sum is σ = 727090788096. Its totient is φ = 555248749440.

The previous prime is 638632560851. The next prime is 638632560901. The reversal of 638632560863 is 368065236836.

It is not a de Polignac number, because 638632560863 - 2⁶ = 638632560799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638632560799 and 638632560808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638632560263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1517120 + ... + 1891802.

It is an arithmetic number, because the mean of its divisors is an integer number (45443174256).

Almost surely, 2^638632560863 is an apocalyptic number.

638632560863 is a deficient number, since it is larger than the sum of its proper divisors (88458227233).

638632560863 is a wasteful number, since it uses less digits than its factorization.

638632560863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381454.

The product of its (nonzero) digits is 22394880, while the sum is 56.

The spelling of 638632560863 in words is "six hundred thirty-eight billion, six hundred thirty-two million, five hundred sixty thousand, eight hundred sixty-three".