638822223546 has 32 divisors (see below), whose sum is σ = 1379030788800. Its totient is φ = 196116969984.

The previous prime is 638822223517. The next prime is 638822223547. The reversal of 638822223546 is 645322228836.

It is not an unprimeable number, because it can be changed into a prime (638822223547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9209271 + ... + 9278378.

It is an arithmetic number, because the mean of its divisors is an integer number (43094712150).

Almost surely, 2^638822223546 is an apocalyptic number.

638822223546 is an abundant number, since it is smaller than the sum of its proper divisors (740208565254).

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

638822223546 is a wasteful number, since it uses less digits than its factorization.

638822223546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18488110.

The product of its digits is 6635520, while the sum is 51.

The spelling of 638822223546 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, two hundred twenty-three thousand, five hundred forty-six".