638584846255 has 8 divisors (see below), whose sum is σ = 767075082624. Its totient is φ = 510352365600.

The previous prime is 638584846253. The next prime is 638584846261. The reversal of 638584846255 is 552648485836.

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

It is not a de Polignac number, because 638584846255 - 2¹ = 638584846253 is a prime.

It is a super-3 number, since 3×638584846255³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638584846253) 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, 64433476 + ... + 64443385.

It is an arithmetic number, because the mean of its divisors is an integer number (95884385328).

Almost surely, 2^638584846255 is an apocalyptic number.

638584846255 is a deficient number, since it is larger than the sum of its proper divisors (128490236369).

638584846255 is a wasteful number, since it uses less digits than its factorization.

638584846255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128877857.

The product of its digits is 221184000, while the sum is 64.

The spelling of 638584846255 in words is "six hundred thirty-eight billion, five hundred eighty-four million, eight hundred forty-six thousand, two hundred fifty-five".