216644061 has 32 divisors (see below), whose sum is σ = 319011840. Its totient is φ = 130166784.

The previous prime is 216644059. The next prime is 216644069. The reversal of 216644061 is 160446612.

It is not a de Polignac number, because 216644061 - 2¹ = 216644059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216644069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 336606 + ... + 337248.

It is an arithmetic number, because the mean of its divisors is an integer number (9969120).

Almost surely, 2^216644061 is an apocalyptic number.

It is an amenable number.

216644061 is a deficient number, since it is larger than the sum of its proper divisors (102367779).

216644061 is a wasteful number, since it uses less digits than its factorization.

216644061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 216644061 is about 14718.8335475336. The cubic root of 216644061 is about 600.5957610300.

The spelling of 216644061 in words is "two hundred sixteen million, six hundred forty-four thousand, sixty-one".