638678832471 has 8 divisors (see below), whose sum is σ = 946190862960. Its totient is φ = 425785888296.

The previous prime is 638678832461. The next prime is 638678832481. The reversal of 638678832471 is 174238876836.

638678832471 is a `hidden beast` number, since 6 + 3 + 86 + 7 + 8 + 83 + 2 + 471 = 666.

638678832471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (638678832461) and next prime (638678832481).

It is not a de Polignac number, because 638678832471 - 2²⁵ = 638645278039 is a prime.

It is a super-3 number, since 3×638678832471³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638678832399 and 638678832408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638678832461) 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, 11827385760 + ... + 11827385813.

It is an arithmetic number, because the mean of its divisors is an integer number (118273857870).

Almost surely, 2^638678832471 is an apocalyptic number.

638678832471 is a deficient number, since it is larger than the sum of its proper divisors (307512030489).

638678832471 is a wasteful number, since it uses less digits than its factorization.

638678832471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23654771582 (or 23654771576 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 63.

The spelling of 638678832471 in words is "six hundred thirty-eight billion, six hundred seventy-eight million, eight hundred thirty-two thousand, four hundred seventy-one".