638822221862 has 64 divisors (see below), whose sum is σ = 1091031819840. Its totient is φ = 277868236800.

The previous prime is 638822221859. The next prime is 638822221889. The reversal of 638822221862 is 268122228836.

It is a super-2 number, since 2×638822221862² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638822221862.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 57769838 + ... + 57780894.

It is an arithmetic number, because the mean of its divisors is an integer number (17047372185).

Almost surely, 2^638822221862 is an apocalyptic number.

638822221862 is a deficient number, since it is larger than the sum of its proper divisors (452209597978).

638822221862 is a wasteful number, since it uses less digits than its factorization.

638822221862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11897.

The product of its digits is 1769472, while the sum is 50.

The spelling of 638822221862 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, two hundred twenty-one thousand, eight hundred sixty-two".