220635665 has 8 divisors (see below), whose sum is σ = 276274368. Its totient is φ = 168834160.

The previous prime is 220635641. The next prime is 220635671. The reversal of 220635665 is 566536022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220635665 - 2¹² = 220631569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 959171 + ... + 959400.

It is an arithmetic number, because the mean of its divisors is an integer number (34534296).

Almost surely, 2^220635665 is an apocalyptic number.

It is an amenable number.

220635665 is a deficient number, since it is larger than the sum of its proper divisors (55638703).

220635665 is a wasteful number, since it uses less digits than its factorization.

220635665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918599.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 220635665 is about 14853.8097806590. The cubic root of 220635665 is about 604.2619372128.

The spelling of 220635665 in words is "two hundred twenty million, six hundred thirty-five thousand, six hundred sixty-five".