163833221538 has 64 divisors (see below), whose sum is σ = 421784229120. Its totient is φ = 46168258176.

The previous prime is 163833221533. The next prime is 163833221551. The reversal of 163833221538 is 835122338361.

163833221538 is a `hidden beast` number, since 1 + 6 + 3 + 83 + 32 + 2 + 1 + 538 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 163833221493 and 163833221502.

It is not an unprimeable number, because it can be changed into a prime (163833221533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2941045 + ... + 2996232.

It is an arithmetic number, because the mean of its divisors is an integer number (6590378580).

Almost surely, 2^163833221538 is an apocalyptic number.

163833221538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

163833221538 is an abundant number, since it is smaller than the sum of its proper divisors (257951007582).

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

163833221538 is a wasteful number, since it uses less digits than its factorization.

163833221538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937368 (or 5937362 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

Adding to 163833221538 its reverse (835122338361), we get a palindrome (998955559899).

The spelling of 163833221538 in words is "one hundred sixty-three billion, eight hundred thirty-three million, two hundred twenty-one thousand, five hundred thirty-eight".