164221616 has 20 divisors (see below), whose sum is σ = 342655152. Its totient is φ = 75794496.

The previous prime is 164221597. The next prime is 164221627. The reversal of 164221616 is 616122461.

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 3 ways as a sum of consecutive naturals, for example, 394556 + ... + 394971.

Almost surely, 2^164221616 is an apocalyptic number.

164221616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

164221616 is an abundant number, since it is smaller than the sum of its proper divisors (178433536).

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

164221616 is a wasteful number, since it uses less digits than its factorization.

164221616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789548 (or 789542 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 164221616 is about 12814.8982048239. The cubic root of 164221616 is about 547.6168134786.

The spelling of 164221616 in words is "one hundred sixty-four million, two hundred twenty-one thousand, six hundred sixteen".