216565801 has 8 divisors (see below), whose sum is σ = 221397120. Its totient is φ = 211743888.

The previous prime is 216565697. The next prime is 216565807. The reversal of 216565801 is 108565612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216565801 - 2⁹ = 216565289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216565807) by changing a digit.

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, 65455 + ... + 68683.

It is an arithmetic number, because the mean of its divisors is an integer number (27674640).

Almost surely, 2^216565801 is an apocalyptic number.

It is an amenable number.

216565801 is a deficient number, since it is larger than the sum of its proper divisors (4831319).

216565801 is a wasteful number, since it uses less digits than its factorization.

216565801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 216565801 is about 14716.1748086926. The cubic root of 216565801 is about 600.5234330451.

The spelling of 216565801 in words is "two hundred sixteen million, five hundred sixty-five thousand, eight hundred one".