638582646342 has 8 divisors (see below), whose sum is σ = 1277165292696. Its totient is φ = 212860882112.

The previous prime is 638582646341. The next prime is 638582646407. The reversal of 638582646342 is 243646285836.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

638582646342 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638582646341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53215220523 + ... + 53215220534.

It is an arithmetic number, because the mean of its divisors is an integer number (159645661587).

Almost surely, 2^638582646342 is an apocalyptic number.

638582646342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638582646342 is a wasteful number, since it uses less digits than its factorization.

638582646342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106430441062.

The product of its digits is 39813120, while the sum is 57.

The spelling of 638582646342 in words is "six hundred thirty-eight billion, five hundred eighty-two million, six hundred forty-six thousand, three hundred forty-two".