638580884231 has 4 divisors (see below), whose sum is σ = 647574981264. Its totient is φ = 629586787200.

The previous prime is 638580884189. The next prime is 638580884243. The reversal of 638580884231 is 132488085836.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638580884231 is a prime.

It is a super-2 number, since 2×638580884231² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638580884251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4497048410 + ... + 4497048551.

It is an arithmetic number, because the mean of its divisors is an integer number (161893745316).

Almost surely, 2^638580884231 is an apocalyptic number.

638580884231 is a deficient number, since it is larger than the sum of its proper divisors (8994097033).

638580884231 is an equidigital number, since it uses as much as digits as its factorization.

638580884231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8994097032.

The product of its (nonzero) digits is 8847360, while the sum is 56.

The spelling of 638580884231 in words is "six hundred thirty-eight billion, five hundred eighty million, eight hundred eighty-four thousand, two hundred thirty-one".