255516217 has 8 divisors (see below), whose sum is σ = 279699840. Its totient is φ = 231491760.

The previous prime is 255516211. The next prime is 255516221. The reversal of 255516217 is 712615552.

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 255516217 - 2⁷ = 255516089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255516211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36417 + ... + 42862.

It is an arithmetic number, because the mean of its divisors is an integer number (34962480).

Almost surely, 2^255516217 is an apocalyptic number.

It is an amenable number.

255516217 is a deficient number, since it is larger than the sum of its proper divisors (24183623).

255516217 is a wasteful number, since it uses less digits than its factorization.

255516217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79583.

The product of its digits is 21000, while the sum is 34.

The square root of 255516217 is about 15984.8746319763. The cubic root of 255516217 is about 634.5601906269.

The spelling of 255516217 in words is "two hundred fifty-five million, five hundred sixteen thousand, two hundred seventeen".