221663065 has 32 divisors (see below), whose sum is σ = 297513216. Its totient is φ = 157489920.

The previous prime is 221663053. The next prime is 221663089. The reversal of 221663065 is 560366122.

It is not a de Polignac number, because 221663065 - 2¹¹ = 221661017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197887 + ... + 199003.

It is an arithmetic number, because the mean of its divisors is an integer number (9297288).

Almost surely, 2^221663065 is an apocalyptic number.

It is an amenable number.

221663065 is a deficient number, since it is larger than the sum of its proper divisors (75850151).

221663065 is a wasteful number, since it uses less digits than its factorization.

221663065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 221663065 is about 14888.3533340662. The cubic root of 221663065 is about 605.1984095278.

The spelling of 221663065 in words is "two hundred twenty-one million, six hundred sixty-three thousand, sixty-five".