163221645 has 16 divisors (see below), whose sum is σ = 261711360. Its totient is φ = 86865984.

The previous prime is 163221631. The next prime is 163221661. The reversal of 163221645 is 546122361.

It is not a de Polignac number, because 163221645 - 2¹⁶ = 163156109 is a prime.

It is a super-3 number, since 3×163221645³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4174 + ... + 18543.

It is an arithmetic number, because the mean of its divisors is an integer number (16356960).

Almost surely, 2^163221645 is an apocalyptic number.

163221645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163221645 is a deficient number, since it is larger than the sum of its proper divisors (98489715).

163221645 is a wasteful number, since it uses less digits than its factorization.

163221645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23204.

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

The square root of 163221645 is about 12775.8226740981. The cubic root of 163221645 is about 546.5030417412.

The spelling of 163221645 in words is "one hundred sixty-three million, two hundred twenty-one thousand, six hundred forty-five".