163221456 has 40 divisors (see below), whose sum is σ = 424007584. Its totient is φ = 54103680.

The previous prime is 163221449. The next prime is 163221469. The reversal of 163221456 is 654122361.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706 + ... + 18081.

Almost surely, 2^163221456 is an apocalyptic number.

163221456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

163221456 is an abundant number, since it is smaller than the sum of its proper divisors (260786128).

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

163221456 is a wasteful number, since it uses less digits than its factorization.

163221456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18979 (or 18973 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 163221456 is about 12775.8152773121. The cubic root of 163221456 is about 546.5028308029.

The spelling of 163221456 in words is "one hundred sixty-three million, two hundred twenty-one thousand, four hundred fifty-six".