638584846365 has 8 divisors (see below), whose sum is σ = 1021735754208. Its totient is φ = 340578584720.

The previous prime is 638584846357. The next prime is 638584846409. The reversal of 638584846365 is 563648485836.

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

It is not a de Polignac number, because 638584846365 - 2³ = 638584846357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638584846296 and 638584846305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21286161531 + ... + 21286161560.

It is an arithmetic number, because the mean of its divisors is an integer number (127716969276).

Almost surely, 2^638584846365 is an apocalyptic number.

It is an amenable number.

638584846365 is a deficient number, since it is larger than the sum of its proper divisors (383150907843).

638584846365 is a wasteful number, since it uses less digits than its factorization.

638584846365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42572323099.

The product of its digits is 398131200, while the sum is 66.

The spelling of 638584846365 in words is "six hundred thirty-eight billion, five hundred eighty-four million, eight hundred forty-six thousand, three hundred sixty-five".