216652257 has 6 divisors (see below), whose sum is σ = 312942162. Its totient is φ = 144434832.

The previous prime is 216652253. The next prime is 216652259. The reversal of 216652257 is 752256612.

216652257 is a `hidden beast` number, since 21 + 66 + 522 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 204604416 + 12047841 = 14304^2 + 3471^2 .

It is not a de Polignac number, because 216652257 - 2² = 216652253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216652253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12036228 + ... + 12036245.

It is an arithmetic number, because the mean of its divisors is an integer number (52157027).

Almost surely, 2^216652257 is an apocalyptic number.

It is an amenable number.

216652257 is a deficient number, since it is larger than the sum of its proper divisors (96289905).

216652257 is a wasteful number, since it uses less digits than its factorization.

216652257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24072479 (or 24072476 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 216652257 is about 14719.1119637022. Note that the first 3 decimals coincide. The cubic root of 216652257 is about 600.6033347752.

The spelling of 216652257 in words is "two hundred sixteen million, six hundred fifty-two thousand, two hundred fifty-seven".