216506263 has 8 divisors (see below), whose sum is σ = 227156096. Its totient is φ = 206085600.

The previous prime is 216506249. The next prime is 216506287. The reversal of 216506263 is 362605612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216506263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216506233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55356 + ... + 59137.

It is an arithmetic number, because the mean of its divisors is an integer number (28394512).

Almost surely, 2^216506263 is an apocalyptic number.

216506263 is a deficient number, since it is larger than the sum of its proper divisors (10649833).

216506263 is a wasteful number, since it uses less digits than its factorization.

216506263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114585.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 216506263 is about 14714.1517934266. The cubic root of 216506263 is about 600.4683962834.

The spelling of 216506263 in words is "two hundred sixteen million, five hundred six thousand, two hundred sixty-three".