638584543543 has 16 divisors (see below), whose sum is σ = 683053278336. Its totient is φ = 594886694400.

The previous prime is 638584543469. The next prime is 638584543549. The reversal of 638584543543 is 345345485836.

It is a cyclic number.

It is not a de Polignac number, because 638584543543 - 2²¹ = 638582446391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638584543549) 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, 5684305 + ... + 5795557.

It is an arithmetic number, because the mean of its divisors is an integer number (42690829896).

Almost surely, 2^638584543543 is an apocalyptic number.

638584543543 is a deficient number, since it is larger than the sum of its proper divisors (44468734793).

638584543543 is a wasteful number, since it uses less digits than its factorization.

638584543543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114714.

The product of its digits is 82944000, while the sum is 58.

The spelling of 638584543543 in words is "six hundred thirty-eight billion, five hundred eighty-four million, five hundred forty-three thousand, five hundred forty-three".