216426863 has 4 divisors (see below), whose sum is σ = 216486888. Its totient is φ = 216366840.

The previous prime is 216426857. The next prime is 216426871. The reversal of 216426863 is 368624612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216426863 - 2⁸ = 216426607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216426883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24233 + ... + 31938.

It is an arithmetic number, because the mean of its divisors is an integer number (54121722).

Almost surely, 2^216426863 is an apocalyptic number.

216426863 is a deficient number, since it is larger than the sum of its proper divisors (60025).

216426863 is an equidigital number, since it uses as much as digits as its factorization.

216426863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60024.

The product of its digits is 82944, while the sum is 38.

The square root of 216426863 is about 14711.4534632034. The cubic root of 216426863 is about 600.3949834416.

The spelling of 216426863 in words is "two hundred sixteen million, four hundred twenty-six thousand, eight hundred sixty-three".