216616253 has 4 divisors (see below), whose sum is σ = 247561440. Its totient is φ = 185671068.

The previous prime is 216616249. The next prime is 216616289. The reversal of 216616253 is 352616612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216616253 - 2² = 216616249 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216616223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15472583 + ... + 15472596.

It is an arithmetic number, because the mean of its divisors is an integer number (61890360).

Almost surely, 2^216616253 is an apocalyptic number.

It is an amenable number.

216616253 is a deficient number, since it is larger than the sum of its proper divisors (30945187).

216616253 is an equidigital number, since it uses as much as digits as its factorization.

216616253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30945186.

The product of its digits is 12960, while the sum is 32.

The square root of 216616253 is about 14717.8888771454. Note that the first 4 decimals coincide. The cubic root of 216616253 is about 600.5700628387.

The spelling of 216616253 in words is "two hundred sixteen million, six hundred sixteen thousand, two hundred fifty-three".